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3863548
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Patent number 3,863,548
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Issue date Feb 4, 1975
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
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3726188
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Patent number 3,726,188
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Issue date Apr 10, 1973
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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3645172
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Patent number 3,645,172
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Issue date Feb 29, 1972
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
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1445996
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Patent number 1,445,996
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Issue date Feb 20, 1923
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B66 - HOISTING LIFTING HAULING