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3420059
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Patent number 3,420,059
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Issue date Jan 7, 1969
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
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3220316
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Patent number 3,220,316
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Issue date Nov 30, 1965
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
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3035553
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Patent number 3,035,553
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Issue date May 22, 1962
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...