- Advanced Directional Drilling Systems, Inc.
- American Augers, Inc.
- Ardco Ind.
- Barbco, Inc.
- Bolder Underground, Inc.
- Case Corp./Boor-Mor, Inc.
- Cherrington
- Contractors Mfg Services, Inc.
- Ditch Witch
- Ingersol-Rand
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- Juggernaut, Inc.
- Laney Directional Drilling, Co.
- Melfred Borzall
- Straightline Mfg, Inc.
- Tripp Technologies Corp.
- TT Technologies, Inc.
- Tulsa Rig Iron
- Utilix Corp. - Flowmole
- Vermeer Mfg Co., Inc.
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