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3693507
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Patent number 3,693,507
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Issue date Sep 26, 1972
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
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3291001
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Patent number 3,291,001
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Issue date Dec 13, 1966
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
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2416940
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Patent number 2,416,940
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Issue date Mar 4, 1947
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...