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Owen K. Crist
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Bedford, PA, US
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last 30 patents
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Patent Grant
Drill bit
Patent number
4,711,312
Issue date
Dec 8, 1987
The Marmon Group, Inc.
Donald L. Leibee
E21 - EARTH DRILLING MINING
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Patent Grant
Drill bit
Patent number
4,605,079
Issue date
Aug 12, 1986
The Marmon Group
Donald L. Leibee
E21 - EARTH DRILLING MINING
Bedford, PA, US
The Marmon Group, Inc.
Donald L. Leibee
E21 - EARTH DRILLING MINING