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3856150
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Patent number 3,856,150
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Issue date Dec 24, 1974
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B66 - HOISTING LIFTING HAULING
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3209920
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Patent number 3,209,920
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Issue date Oct 5, 1965
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B66 - HOISTING LIFTING HAULING
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3190457
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Patent number 3,190,457
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Issue date Jun 22, 1965
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B66 - HOISTING LIFTING HAULING
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3161299
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Patent number 3,161,299
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Issue date Dec 15, 1964
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B66 - HOISTING LIFTING HAULING
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1380591
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Patent number 1,380,591
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Issue date Jun 7, 1921
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B66 - HOISTING LIFTING HAULING