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ENGINEERING COMPANIES
Alliance Engineering
BCCK Engineering, Inc. EMD
Gulf Interstate
Honeywell
HPF Consultants
Linde BOC
Meers Engineering
Mustang Engineering
Ref-Chem Corporation River Consulting
Siemens Westinghouse
(TKS) Tesenderlo Kerly Service
Thomas Russell Company
Turn-Key Specialists, Inc.
Washington Group
Willbros, Inc.
OIL AND GAS COMPANIES
Bobcat Storage Bonanza Creek
Centerpoint
Conoco Phillips
Chevron, Inc. Crestwood Midstream
CrossTex Devon
Duke Energy
El Paso & Affiliates
Enbridge Energy
Energy Transfer
Enogex
Enstor Inc.
EOG Resources
Exxon / Mobil
Gulf South
Kinder Morgan Inc.
LDH Energy Resources
Marathon Oil
MarkWest
NiSource / Columbia Gas Nortex
Northern Natural Gas Company
OXY USA, Inc. Pecan Pipeline
Plains All American
Quicksilver Resources
Regency Gas
Southern Natural Gas Company
Superior Pipeline
Sun Oil
Targa Resources
Teppco & Affiliates
Tennessee Gas
Williams & Affiliates
XTO Energy
OTHER INDUSTRIES
Air Products
Municipal Water Supply
Parks and Wildlife
Gypsum Manufacturing
Wind Energy
CONSTRUCTION COMPANIES
Bluewater Constructors, Inc.
Bowden Construction Company
Evers and Sons, Inc.
Exterran G-Fource
Holloman Construction, Inc InfaSource ISTI
Matrix Services, Inc.
Mid-American Pipeline
Ranger Plant Construction, Inc
Ref-Chem Corporation
Sunland Construction, Inc. | 
