- Amarillo Chitton AirFlo
- Manufactures Chittom Equipment Company (CHECO) products like industrial propeller fans and air moving equipments.
- DRB Industries
- Serves gas turbine filtration, evaporative cooling media, moisture separation, instruments and gages, and fog cooling devices at factory-direct prices.
- Drive Shafts, Inc.
- Services driveline shaft needs for the automotive, heavy duty, agricultural, and industrial sectors.
- Integrated Service Company LLC
- Combines construction services, tank services, field services, specialty welding, manufacturing, turnkey project services, safety services and communications services into an integrated package for construction and turnaround needs.
- Tulsa Heaters Inc.
- Has built a reputation as one of the world's leading designers and manufacturers of fired heaters, waste heat recovery units (WHRU's), and complementary systems.
- Tulsa Winch Group
- Industry leader in the manufacture of winch gearbox and load information systems.
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