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Well point
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Patent number 5,145,015
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Issue date Sep 8, 1992
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George A. Thompson
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E21 - EARTH DRILLING MINING
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Oscillatory pump with elastic divider
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Patent number 5,139,401
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Issue date Aug 18, 1992
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George A. Thompson
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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Reciprocating piston pump
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Patent number 5,011,382
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Issue date Apr 30, 1991
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George A. Thompson
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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Rotary pump with cutting means
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Patent number 4,984,975
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Issue date Jan 15, 1991
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George A. Thompson
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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Rotary pump
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Patent number 4,772,187
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Issue date Sep 20, 1988
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George A. Thompson
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...