Dolph R. Crawley

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Arlington, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Earth-boring bit having cutter with replaceable kerf ring with cont...
- Patent number 5,785,135
- Issue date Jul 28, 1998
- Baker Hughes Incorporated
- Dolph Crawley
- E21 - EARTH DRILLING MINING
Information Patent Grant
Mounting system for raise and shaft cutters
- Patent number 5,487,435
- Issue date Jan 30, 1996
- Baker Hughes Incorporated
- Dolph R. Crawley
- E21 - EARTH DRILLING MINING