Dennis J. Wehner

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Baden, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for controlling a rotary percussive hydraulic...
- Patent number 4,516,467
- Issue date May 14, 1985
- Schroeder Brothers Corporation
- Keith Keeney
- E21 - EARTH DRILLING MINING
Information Patent Grant
Toggle type temporary roof support for mining machinery
- Patent number 4,460,294
- Issue date Jul 17, 1984
- Schroeder Brothers Corporation
- William R. Cobb
- E21 - EARTH DRILLING MINING