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Integral buoyant riser
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Patent number 4,648,747
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Issue date Mar 10, 1987
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Hughes Tool Company
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Bruce J. Watkins
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E21 - EARTH DRILLING MINING
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Metallic seat construction for valves
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Patent number 4,124,194
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Issue date Nov 7, 1978
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ACF Industries, Incorporated
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Patricio D. Alvarez
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Actuator for expanding gate valves
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Patent number 4,103,863
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Issue date Aug 1, 1978
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ACF Industries, Incorporated
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Robert C. Houlgrave
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES