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Ram type blowout preventor
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Patent number 6,089,526
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Issue date Jul 18, 2000
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Stewart & Stevenson Services, Inc.
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Richard A. Olson
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E21 - EARTH DRILLING MINING
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Ram-type blowout preventer
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Patent number 5,653,418
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Issue date Aug 5, 1997
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Cooper Cameron Corporation
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Richard A. Olson
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E21 - EARTH DRILLING MINING
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-
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Blowout preventer ram lock
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Patent number 4,290,577
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Issue date Sep 22, 1981
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Hydril Company
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Richard A. Olson
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E21 - EARTH DRILLING MINING
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Blowout preventer ram lock
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Patent number 4,076,208
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Issue date Feb 28, 1978
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Hydril Company
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Richard A. Olson
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E21 - EARTH DRILLING MINING