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Wellhead seal
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Patent number 4,791,987
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Issue date Dec 20, 1988
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Cameron Iron Works USA, Inc.
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Thomas G. Cassity
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E21 - EARTH DRILLING MINING
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Subsea wellhead seal assembly
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Patent number 4,759,409
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Issue date Jul 26, 1988
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Cameron Iron Works USA, Inc.
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Steven D. Gullion
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E21 - EARTH DRILLING MINING
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Subsea wellhead seal assembly
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Patent number 4,742,874
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Issue date May 10, 1988
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Cameron Iron Works USA, Inc.
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Steven D. Gullion
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E21 - EARTH DRILLING MINING