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3455344
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Patent number 3,455,344
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Issue date Jul 15, 1969
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B66 - HOISTING LIFTING HAULING
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1791844
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Patent number 1,791,844
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Issue date Feb 10, 1931
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B66 - HOISTING LIFTING HAULING
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1720626
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Patent number 1,720,626
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Issue date Jul 9, 1929
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B66 - HOISTING LIFTING HAULING
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1452330
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Patent number 1,452,330
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Issue date Apr 17, 1923
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B66 - HOISTING LIFTING HAULING