| 5D Engineering, LLC |
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| A+ Corporation |
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| Absolute Noise Control/EZ Pipe Wraps |
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| Accurate Gas Products, LLC |
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| Accurate Lab Audits, LLC |
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| ADI Analytics |
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| Aeon PEC |
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| Afton Pumps, Inc. |
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| Airgas |
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| Alfa Laval Niagara |
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| Allan Edwards, Inc. |
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| Allegiance Electric LLC |
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| Alliance Emissions Monitoring, LLC |
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| Alliance Source Testing |
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| Alpha Engineering International |
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| Alpine Site Services |
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| AMACS Process Tower Internals |
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| Analytical Systems Keco |
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| Applied Control |
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| ARC Energy |
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| Archrock, Inc. |
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| Ariel Corporation |
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| Arkema, Inc. |
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| Astec Industries (Heatec, Inc.) |
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| Atlas Copco Gas and Process |
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| Atwell, LLC |
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| Audubon |
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| AVEVA |
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| AXH Air-Coolers |
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| Azota Gas Processing, Ltd. |
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| Baker & O'Brien, Inc. |
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| Baltimore Aircoil Co. |
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| Barry D. Payne & Associates – Mangan Inc. |
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| Bartlett & West |
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| Bartlett Equipment Co. |
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| BASF Corp. |
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| BCCK Holding |
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| Bexar Energy Holdings, Inc. |
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| BGE, Inc. |
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| Bi-Con Engineering LLC |
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| Bilfinger Inc. |
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| Black & Veatch Corp. |
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| Blackwater Industries |
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| Blair Engineering |
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| Boardman, LLC |
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| Bold Production Services, LLC |
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| Borets |
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| Bowden Construction Co. Ltd. |
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| Brown & Root Industrial Services |
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| Bryan Research & Engineering, LLC |
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| Buffalo Gap Instrumentation & Electrical |
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| Burns & McDonnell |
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| BWFS Industries, LLC |
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| C3 Resources, LLC |
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| Calpine Energy Solutions |
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| Cameron, A Schlumberger Company |
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| Catalytic Combustion Corporation |
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| Catalytic Products International, Inc. |
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| Catco USA |
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| Caterpillar, Inc. |
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| CECO-Compressor Engineering Corp. |
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| ChampionX |
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| Charbonneau Industries, Inc. |
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| Charger Energy Services LLC |
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| Charis Engineering, LLC |
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| Chart Industries |
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| ChemTreat, Inc. |
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| Cheniere Energy |
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| Chiyoda Corp. |
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| Civil and Environmental Consultants |
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| Coastal Chemical Co., LLC |
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| ColdStream Energy, LLC |
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| Compass Compression Solutions, Inc |
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| COMPRESSORtech2 |
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| Cooper Machinery Services |
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| CoreWorks, LLC |
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| Critical Control Energy Services |
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| CSI Compressco LP |
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| Dahlia |
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| DCG Partnership 1, Ltd. |
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| Dearing Compressor & Pump Co. |
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| Derrick Oneal Company LLC |
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| Devco Process Heaters |
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| Dew Point Control, LLC |
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| Diablo Analytical, Inc. |
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| Dickson Process Systems, Ltd. |
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| DistributionNow |
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| Dollahon PR |
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| Dual Drive Technologies |
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| DXP Enterprises Inc. |
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| Eastman |
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| Eaton Metal Products |
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| EcoVapor Recovery Systems |
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| EDG, Inc. |
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| Element Integrity Group |
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| Emerson |
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| Empact Analytical Systems, Inc. |
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| Encore Oilfield Services, LLC |
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| Endress+Hauser USA |
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| Enerflex |
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| EnerSys Corporation |
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| EnFlex Group |
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| Engineered Thermal Solutions |
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| ENGlobal U.S. Inc. |
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| Envent Technologies, LLC |
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| EPCON International |
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| EPIC |
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| Equity Engineering Group, Inc. |
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| ERM - Dallas Office |
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| eSimulation, Inc. |
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| EXTERRAN |
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| F&C Engineers |
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| Fabsco Shell & Tube, LLC |
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| Federal Services, LLC |
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| FES-Southwest, Inc. |
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| FESCO, Ltd. |
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| Files and Associates |
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| Filtration Technology Corp. |
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| Fives Cryo, Inc. |
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| Flatrock Engineering and Environmental |
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| FlexSteel Pipeline Technologies |
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| Flow Control Services |
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| Fluid Flow Products, Inc. |
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| Fluor Enterprises, Inc. |
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| Freese and Nichols, Inc. |
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| Fulton Thermal Corp. |
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| FW Murphy Production Controls |
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| G2 Integrated Solutions |
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| Galileo Technologies |
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| Gas Equipment Co., Inc. |
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| Gas Processing & LNG |
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| Gas Technology Corp. |
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| Gas Treatment Services B.V. |
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| GasTech Engineering, LLC |
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| GEA Systems North America LLC |
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| Gemstar, Inc. |
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| GTC Vorro |
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| GTUIT |
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| Gulf Coast Chemical, LLC |
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| Gulf Coast Engineered Solutions, Inc. |
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| Gulf Interstate Engineering |
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| H2W United, LLC |
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| Halff Associates, Inc. |
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| Heat Transfer Specialists, Inc. |
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| Heath Consultants Incorporated |
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| Hobre USA |
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| Honeywell UOP |
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| Hotstart Sales LLC |
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| Houston Integrity Consultants |
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| Howard Field Services, LLC |
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| HPI Energy Services LLC |
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| Hunt, Guillot & Associates |
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| Huntsman Corp. |
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| Hydrocarbon Measurement Consultants, Inc. |
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| ICA Fluor |
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| Industrial Distributors, Inc. |
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| INEOS GAS/SPEC Technology Group |
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| Infinity Project Management, Inc. (IPM) |
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| INNIO Waukesha Gas Engines Inc. |
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| International Energy Services |
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| Interra Global Corp. |
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| Interstate Treating, Inc. |
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| Intertek Caleb Brett |
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| ION PRO Services, LLC |
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| ISTI Plant Services |
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| J-W Power Company |
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| J. H. Foglietta Consulting, LLC |
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| J.S. James Co. |
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| Jasper Ventures, Inc. |
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| JFE Engineering Corporation |
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| JGC Corporation |
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| John Zink Company, LLC |
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| Johnson Matthey |
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| Johnson Petrotech Services, Inc. |
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| Johnson Screens |
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| Jonell, Inc. |
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| Joule Processing, LLC |
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| JP3 Measurement |
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| Kahuna Ventures |
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| Kane Environmental Engineering |
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| Kiewit Energy Group |
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| Koch-Glitsch LP |
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| Kodiak Gas Services |
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| L.A. Turbine |
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| Laboratory Services |
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| Larco Industries |
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| LCM Industries, Inc. |
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| Lexicon, Inc. |
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| Lilly Consulting |
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| Linde Engineering Americas |
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| Lindsayca Solutions |
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| Logic Masterminds, LLC |
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| Lummus Technology |
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| M Chemical Company |
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| M J & H Fabrication |
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| M4 Equipment |
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| Mangan, Inc. |
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| Master Corporation |
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| Matrix PDM Engineering |
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| Mayekawa USA, Inc. |
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| McCartney Gas Advisors, LLC |
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| McClung Energy Services, LLC |
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| Melland Engineering & Consulting |
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| Merichem |
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| Midstream Energy Group, Inc. |
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| Mitsubishi Heavy Industries Compressor International |
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| Monico Monitoring, Inc. |
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| Moore Control Systems, Inc. |
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| Morrow Energy |
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| Movilab, S.A. de C.V. |
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| MRC Global Inc. |
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| Munters |
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| Mustang Cat |
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| Mustang Sampling |
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| Nalco Water |
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| Neuman & Esser USA, Inc. |
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| New Industries, LLC |
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| New Tech Global Ventures |
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| Nexo Solutions |
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| Nikkiso CE&IG |
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| NorthStar Energy Services, Inc. |
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| Norwood S&S, LLC |
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| NTACT Operations, LLC |
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| OGT |
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| Oliver Equipment Co. |
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| Olympus Scientific Solutions |
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| Omni Air & Nitrogen |
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| Operational Sustainability, LLC |
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| optek-Danulat, Inc. |
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| Optimized Gas Treating, Inc. |
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| Optimized Process Designs |
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| Optimized Process Furnaces |
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| Pall Corporation |
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| Pantechs Laboratories, Inc. |
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| Paratherm - Heat Transfer Fluids |
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| Parker IPF (PECO) Parker Hannifin Corp. |
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| Pasadyn, Inc. |
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| Patriot Process Equipment |
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| Payne-Huber Engineering, Inc. |
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| PCES, LLC |
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| Peak AI Solutions |
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| Pegasus EHS |
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| Pentair Filtration Solutions, Inc. |
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| PERC Engineering, LLC |
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| Peso Energy USA |
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| Petron Asia Energy PTE Ltd. |
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| PetroSkills/John M. Campbell |
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| PLC Construction Inc. |
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| Polaris Services, LLC |
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| Powertherm Maxim |
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| Precision Catalyst |
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| Prime Controls, LP |
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| Profab Construction & Supply |
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| ProSep Inc. |
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| Proteum Energy, LLC |
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| PSI (Process Solutions Integration) |
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| Puffer Sweiven |
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| Q.B. Johnson Manufacturing, Inc. |
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| Quadra Chemicals, Inc. |
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| QuantityWare GmbH |
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| Quest Consultants Inc. |
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| Quorum Business Solutions |
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| R & R Engineering Co., Inc. |
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| R&H Technical Sales, Inc. |
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| Raffinate Technologies |
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| Ramboll |
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| Ranger Plant Constructional Co. Inc. |
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| Red Ball Technical Gas Services |
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| Redd Ridge Consulting, LLC |
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| Reese Midstream Report |
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| Ref-Chem LP |
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| Regard Resources Co., Inc. |
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| Reset Energy |
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| Reverse Technology Resources LLC |
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| Rhine Ruhr Pty, Ltd. |
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| River City Engineering |
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| Ro-Flo Compressors, LLC |
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| Ross Group |
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| Roto-flow, An Air Products Business |
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| Rotor-Tech, Inc. |
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| Royal Filter Mfg. Co., Inc. |
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| S & B Engineers and Constructors, Ltd. |
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| S&B Helical |
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| S2W Contracting LLC |
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| Samuel Engineering, Inc. |
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| Sapphire Technologies, LLC |
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| Sargent & Lundy |
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| Saulsbury Industries, Inc. |
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| Scelerin Heaters, LLC |
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| Schultz Process Services, Inc. |
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| Scion Instruments |
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| SEC Energy Products & Services, LP |
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| Select Engineering, Inc. |
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| Selective Adsorption Associates, Inc. |
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| Sensia Global |
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| Sepra-Chem Corp. |
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| SERO PumpSystems, Inc. |
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| SGS North America Inc. |
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| Shamrock Gas Analysis |
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| Shrieve Chemical Products, Inc. |
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| Siemens |
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| SIGIT Operating Co. |
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| SkySkopes |
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| SME Process Solution |
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| Solar Turbines, Inc. |
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| Southern Heat Exchanger |
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| Spartan Energy Partners |
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| Spitzer Industries |
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| SPL, Inc. |
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| Startec Compression and Process |
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| Stellar Plant Services |
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| Strategic Automation Services, LLC |
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| Stress Engineering Services |
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| SULPETRO, Inc. |
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| Sulzer Chemtech |
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| Sundyne Corporation |
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| Sunland Construction, Inc. |
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| Superior Energy Systems, Ltd. |
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| Tailwater Technical Consulting |
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| Taylor Forge Engineered Systems |
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| TECO-Westinghouse |
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| Tek-Fins Inc. |
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| Texas Pipe & Supply Co., LTD |
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| Texas Turbine, Inc. |
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| TM-EMS, LLC |
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| TMCO Operating, LLC |
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| Tomcej Engineering Inc. |
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| TorcSill Foundations |
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| Torrent Energy Services |
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| Total Energy Corp. |
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| Tower Force |
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| Transcend Solutions, LLC |
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| TransTech Energy |
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| TransTex Treating |
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| Trimeric Corp. |
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| Triumph Gas Technology Consulting |
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| Tryer Process Equipment |
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| TTS Midstream |
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| Tulco Oils |
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| Tulsa Heaters Midstream |
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| UE Compression |
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| Union Tech |
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| Unison Industrial Solutions |
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| United Steel Structures, Inc. |
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| Univar Solutions |
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| Upstream Development and Engineering, Inc. |
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| Vapor Point |
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| VGas, LLC |
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| Vinson Process Controls |
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| Vintri Technologies LTD |
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| VME |
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| VMG, A Schlumberger Technology |
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| W Energy Software |
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| W-Industries |
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| Wagner Power Systems |
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| Wanzek Construction, Inc. |
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| Wasson-ECE Instrumentation |
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| Waukesha Pearce Industries |
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| WeldFit Corporation |
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| Western Filter Co., Inc. |
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| White Lion |
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| WinSim Inc. |
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| Wolverine Flow Control, LP |
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| Wood |
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| Worldwide Air Coolers |
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| Worley Group Inc. |
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| WR Grace |
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| WSP |
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| XCEL Group |
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| York Process Systems |
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| ZAP Engineering & Construction Services, Inc. |
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| Zeochem |
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