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3709375
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Patent number 3,709,375
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Issue date Jan 9, 1973
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B66 - HOISTING LIFTING HAULING
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3237782
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Patent number 3,237,782
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Issue date Mar 1, 1966
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B66 - HOISTING LIFTING HAULING
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2562087
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Patent number 2,562,087
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Issue date Jul 24, 1951
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B66 - HOISTING LIFTING HAULING
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2562086
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Patent number 2,562,086
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Issue date Jul 24, 1951
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B66 - HOISTING LIFTING HAULING