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Flow measurement mandrel
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Patent number 5,861,562
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Issue date Jan 19, 1999
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Camco International Inc.
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Ronald E. Pringle
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E21 - EARTH DRILLING MINING
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Bottom hole drilling assembly
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Patent number 5,394,951
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Issue date Mar 7, 1995
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Camco International Inc.
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Ronald E. Pringle
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E21 - EARTH DRILLING MINING
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Movable joint bent sub
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Patent number 5,314,032
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Issue date May 24, 1994
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Camco International Inc.
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Ronald E. Pringle
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E21 - EARTH DRILLING MINING
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Multiple use well packer
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Patent number 5,311,939
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Issue date May 17, 1994
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Camco International Inc.
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Ronald E. Pringle
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E21 - EARTH DRILLING MINING
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