| AECOM |
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| Anvil Corporation |
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| ARC Energy Equipment |
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| Archrock, Inc. |
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| Aspen Technology, Inc. |
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| Audubon |
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| Azota Ltd. |
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| Barr Engineering Co. |
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| Barry D. Payne & Associates, Inc. |
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| Bartlett & West |
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| Bilfinger Westcon, Inc. |
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| Black & Veatch Corp. |
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| Bowden Construction Co. Ltd. |
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| CAM Integrated Solutions |
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| Catamount Constructors |
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| Chiyoda Corp. |
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| Comal Energy Services LP |
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| CryoSys |
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| DanCar Energy Construction |
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| Echo Group, Ltd. |
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| EDG, Inc. |
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| EMD, Inc. |
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| Emerson |
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| Enerflex |
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| ENGlobal U.S. Inc. |
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| EXTERRAN |
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| Forum Energy Technologies |
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| Freeman and Curiel Engineers, LLP |
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| Freese and Nichols, Inc. |
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| GasTech Engineering, LLC |
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| GHD Services, Inc. |
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| H+M Industrial EPC |
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| Holloman Corporation |
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| Honeywell UOP |
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| Hunt, Guillot & Associates |
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| Interstate Treating, Inc. |
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| ISTI Plant Services |
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| Jacobs |
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| Jasper Ventures, Inc. |
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| JGC Corporation |
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| Joule Processing, LLC |
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| Kahuna Ventures |
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| KBR |
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| KP Engineering, LP |
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| Lexicon, Inc. |
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| Linde Engineering North America Inc. |
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| Mangan, Inc. |
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| Master Corporation |
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| Matrix PDM Engineering |
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| MIRATECH Group, LLC. |
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| MODEC International, Inc. |
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| Moore Control Systems, Inc. |
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| Neuman & Esser USA, Inc. |
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| Nicholas Consulting Group, Inc. |
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| NorthStar Energy Services, Inc. |
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| Oil-GasTech |
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| Optimized Process Designs |
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| PLC Construction Inc. |
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| QPS Engineering |
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| Ref-Chem LP |
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| Regard Resources Co., Inc. |
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| Ross Engineering, LLC |
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| Samuel Engineering, Inc. |
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| Saulsbury Industries, Inc. |
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| Schwob Energy Services |
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| SEC Energy Products & Services, LP |
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| Select Engineering, Inc. |
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| Shafer, Kline & Warren, Inc. |
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| Single Buoy Moorings |
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| SNC-Lavalin |
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| Spartan Energy Partners |
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| STS Consulting Services |
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| Sunland Construction, Inc. |
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| TechnipFMC |
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| TRC Companies, Inc. |
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| UniversalPegasus International |
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| Upstream Development and Engineering, Inc. |
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| Vavco, LLC |
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| VGas, LLC |
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| Walker Industrial |
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| Wanzek Construction, Inc. |
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| Wood |
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| WSP |
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