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Air/water cranes
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Patent number 4,912,890
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Issue date Apr 3, 1990
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Ralph H. Hoyeck
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B66 - HOISTING LIFTING HAULING
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3817397
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Patent number 3,817,397
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Issue date Jun 18, 1974
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B66 - HOISTING LIFTING HAULING
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3378978
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Patent number 3,378,978
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Issue date Apr 23, 1968
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B66 - HOISTING LIFTING HAULING
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3361456
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Patent number 3,361,456
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Issue date Jan 2, 1968
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B66 - HOISTING LIFTING HAULING
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3300061
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Patent number 3,300,061
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Issue date Jan 24, 1967
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B66 - HOISTING LIFTING HAULING
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3168336
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Patent number 3,168,336
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Issue date Feb 2, 1965
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B66 - HOISTING LIFTING HAULING
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2147313
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Patent number 2,147,313
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Issue date Feb 14, 1939
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B66 - HOISTING LIFTING HAULING
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1428887
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Patent number 1,428,887
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Issue date Sep 12, 1922
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B66 - HOISTING LIFTING HAULING