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Wm. Mark Hart
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Littleton, CO, US
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last 30 patents
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Patent Grant
Method and apparatus for determining compressive stress in pillars
Patent number
5,668,325
Issue date
Sep 16, 1997
Cyprus Amax Coal Company
Wm. Mark Hart
E21 - EARTH DRILLING MINING
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Patent Grant
Continuous mining linear advance system
Patent number
5,567,018
Issue date
Oct 22, 1996
Cyprus Amax Minerals Company
Wm. Mark Hart
E21 - EARTH DRILLING MINING