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Bridge crane hoist stop system
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Patent number 4,509,431
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Issue date Apr 9, 1985
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The United States of America as represented by the Secretary of the Navy
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Gordon J. Laskowski
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B66 - HOISTING LIFTING HAULING
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3306233
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Patent number 3,306,233
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Issue date Feb 28, 1967
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B61 - RAILWAYS
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2900923
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Patent number 2,900,923
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Issue date Aug 25, 1959
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B61 - RAILWAYS
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2835207
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Patent number 2,835,207
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Issue date May 20, 1958
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B61 - RAILWAYS
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1726457
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Patent number 1,726,457
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Issue date Aug 27, 1929
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B61 - RAILWAYS
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1690695
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Patent number 1,690,695
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Issue date Nov 6, 1928
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B61 - RAILWAYS
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1594211
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Patent number 1,594,211
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Issue date Jul 27, 1926
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B61 - RAILWAYS
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1446584
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Patent number 1,446,584
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Issue date Feb 27, 1923
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B61 - RAILWAYS
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1409264
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Patent number 1,409,264
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Issue date Mar 14, 1922
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B61 - RAILWAYS