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Well packer
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Patent number 4,671,354
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Issue date Jun 9, 1987
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Otis Engineering Corporation
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William D. Henderson
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E21 - EARTH DRILLING MINING
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Anchor for use in a well
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Patent number 4,441,553
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Issue date Apr 10, 1984
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Otis Engineering Corporation
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John R. Setterberg
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E21 - EARTH DRILLING MINING
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Latch for use in a well
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Patent number 4,438,811
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Issue date Mar 27, 1984
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Otid Engineering Corporation
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Dhirajlal C. Patel
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E21 - EARTH DRILLING MINING
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Valve
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Patent number 4,378,842
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Issue date Apr 5, 1983
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Otis Engineering Corporation
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Dhirajlal C. Patel
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E21 - EARTH DRILLING MINING
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Valve
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Patent number 4,378,847
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Issue date Apr 5, 1983
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Otis Engineering Corporation
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Dhirajlal C. Patel
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E21 - EARTH DRILLING MINING