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Subsurface safety valve
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Patent number 4,527,631
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Issue date Jul 9, 1985
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Ava International Corporation
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Gonzalo Vazquez
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E21 - EARTH DRILLING MINING
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Flow controlling apparatus
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Patent number 4,467,866
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Issue date Aug 28, 1984
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AVA International, Inc.
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Gonzalo Vazquez
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E21 - EARTH DRILLING MINING
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Flow controlling apparatus
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Patent number 4,434,847
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Issue date Mar 6, 1984
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Ava International Corporation
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Gonzalo Vazquez
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E21 - EARTH DRILLING MINING
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