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Hydraulic fluid generator
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Patent number 4,283,915
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Issue date Aug 18, 1981
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McConnell; David P.
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David P. McConnell
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
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Rotary manifold valve mechanism
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Patent number 4,253,380
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Issue date Mar 3, 1981
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McConnell; David P.
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David P. McConnell
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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Fluid operated engine
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Patent number 4,122,757
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Issue date Oct 31, 1978
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McConnell; David P.
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David P. McConnell
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES