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Annulus safety valve
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Patent number 5,211,243
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Issue date May 18, 1993
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Baker Hughes Incorporated
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Scott C. Strattan
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E21 - EARTH DRILLING MINING
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Annulus safety valve
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Patent number 5,207,275
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Issue date May 4, 1993
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Scott C. Strattan
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E21 - EARTH DRILLING MINING
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Safety valve
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Patent number 4,708,163
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Issue date Nov 24, 1987
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Otis Engineering Corporation
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Thomas M. Deaton
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E21 - EARTH DRILLING MINING
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Safety valve
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Patent number 4,664,195
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Issue date May 12, 1987
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Otis Engineering Corporation
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Thomas M. Deaton
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E21 - EARTH DRILLING MINING
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Well safety and kill valve
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Patent number 4,632,187
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Issue date Dec 30, 1986
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Otis Engineering Corporation
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Thomas M. Deaton
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E21 - EARTH DRILLING MINING
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Well safety and kill valve
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Patent number 4,566,478
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Issue date Jan 28, 1986
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Otis Engineering Corporation
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Thomas M. Deaton
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E21 - EARTH DRILLING MINING
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Safety switch for well tools
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Patent number 4,306,628
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Issue date Dec 22, 1981
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Otis Engineering Corporation
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James B. Adams
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F42 - AMMUNITION BLASTING
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Well safety valve system
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Patent number 4,273,186
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Issue date Jun 16, 1981
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Otis Engineering Corporation
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Joseph L. Pearce
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E21 - EARTH DRILLING MINING
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Subsurface safety valve
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Patent number 4,214,606
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Issue date Jul 29, 1980
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Otis Engineering Corporation
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Thomas M. Deaton
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E21 - EARTH DRILLING MINING
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Well latch
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Patent number 4,164,977
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Issue date Aug 21, 1979
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Otis Engineering Corporation
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Henry P. Arendt
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E21 - EARTH DRILLING MINING
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Subsurface safety valve
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Patent number 4,140,153
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Issue date Feb 20, 1979
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Otis Engineering Corporation
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Thomas M. Deaton
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E21 - EARTH DRILLING MINING