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Jack mechanism
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Patent number 4,269,392
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Issue date May 26, 1981
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Henry L. Andersen
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B66 - HOISTING LIFTING HAULING
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Vertical lift assembly
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Patent number 4,068,534
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Issue date Jan 17, 1978
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Claude Descoteaux
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B66 - HOISTING LIFTING HAULING
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2765201
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Patent number 2,765,201
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Issue date Oct 2, 1956
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B66 - HOISTING LIFTING HAULING
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2119953
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Patent number 2,119,953
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Issue date Jun 7, 1938
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B66 - HOISTING LIFTING HAULING
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1910436
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Patent number 1,910,436
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Issue date May 23, 1933
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B66 - HOISTING LIFTING HAULING
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1782889
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Patent number 1,782,889
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Issue date Nov 25, 1930
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B66 - HOISTING LIFTING HAULING
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1576494
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Patent number 1,576,494
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Issue date Mar 16, 1926
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B66 - HOISTING LIFTING HAULING
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1527542
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Patent number 1,527,542
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Issue date Feb 24, 1925
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B66 - HOISTING LIFTING HAULING
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1520785
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Patent number 1,520,785
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Issue date Dec 30, 1924
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B66 - HOISTING LIFTING HAULING
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1514739
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Patent number 1,514,739
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Issue date Nov 11, 1924
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B66 - HOISTING LIFTING HAULING
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1486797
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Patent number 1,486,797
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Issue date Mar 11, 1924
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B66 - HOISTING LIFTING HAULING
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1476096
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Patent number 1,476,096
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Issue date Dec 4, 1923
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B66 - HOISTING LIFTING HAULING
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1443326
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Patent number 1,443,326
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Issue date Jan 23, 1923
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B66 - HOISTING LIFTING HAULING
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1435884
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Patent number 1,435,884
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Issue date Nov 14, 1922
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B66 - HOISTING LIFTING HAULING
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1420555
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Patent number 1,420,555
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Issue date Jun 20, 1922
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B66 - HOISTING LIFTING HAULING
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1347862
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Patent number 1,347,862
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Issue date Jul 27, 1920
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B66 - HOISTING LIFTING HAULING
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1335782
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Patent number 1,335,782
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Issue date Apr 6, 1920
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B66 - HOISTING LIFTING HAULING