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Wellhead structure
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Patent number 4,869,319
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Issue date Sep 26, 1989
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Cameron Iron Works USA, Inc.
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Edward J. Szymozak
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E21 - EARTH DRILLING MINING
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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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Wellhead seals
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Patent number 4,771,828
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Issue date Sep 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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Wellhead seal assembly
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Patent number 4,751,965
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Issue date Jun 21, 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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Tubing packer
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Patent number 4,749,035
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Issue date Jun 7, 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