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Directional well control
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Patent number 4,938,298
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Issue date Jul 3, 1990
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BecField Horizontal Drilling Services Company
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William A. Rehm
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E21 - EARTH DRILLING MINING
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Desilter
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Patent number 4,226,726
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Issue date Oct 7, 1980
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Technical Systems Co.
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William A. Rehm
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E21 - EARTH DRILLING MINING
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Total gas containment system
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Patent number 4,010,012
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Issue date Mar 1, 1977
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Dresser Industries, Inc.
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Phil H. Griffin
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E21 - EARTH DRILLING MINING