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Unloading valve for hopper car
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Patent number 5,375,730
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Issue date Dec 27, 1994
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Columbian Chemicals Company
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Andrew J. Bahr
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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3902434
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Patent number 3,902,434
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Issue date Sep 2, 1975
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B61 - RAILWAYS
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3822650
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Patent number 3,822,650
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Issue date Jul 9, 1974
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B61 - RAILWAYS
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3788530
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Patent number 3,788,530
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Issue date Jan 29, 1974
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B61 - RAILWAYS
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3710729
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Patent number 3,710,729
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Issue date Jan 16, 1973
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B61 - RAILWAYS
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3682105
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Patent number 3,682,105
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Issue date Aug 8, 1972
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B61 - RAILWAYS
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3656666
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Patent number 3,656,666
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Issue date Apr 18, 1972
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B61 - RAILWAYS
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3636887
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Patent number 3,636,887
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Issue date Jan 25, 1972
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B60 - VEHICLES IN GENERAL
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3628466
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Patent number 3,628,466
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Issue date Dec 21, 1971
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B61 - RAILWAYS
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3556469
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Patent number 3,556,469
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Issue date Jan 19, 1971
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B61 - RAILWAYS
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3538858
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Patent number 3,538,858
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Issue date Nov 10, 1970
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B61 - RAILWAYS
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3457878
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Patent number 3,457,878
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Issue date Jul 29, 1969
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B61 - RAILWAYS
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3245592
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Patent number 3,245,592
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Issue date Apr 12, 1966
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B61 - RAILWAYS
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3240165
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Patent number 3,240,165
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Issue date Mar 15, 1966
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B61 - RAILWAYS
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3240166
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Patent number 3,240,166
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Issue date Mar 15, 1966
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B61 - RAILWAYS
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3238898
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Patent number 3,238,898
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Issue date Mar 8, 1966
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B61 - RAILWAYS
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3194454
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Patent number 3,194,454
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Issue date Jul 13, 1965
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B60 - VEHICLES IN GENERAL
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3152824
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Patent number 3,152,824
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Issue date Oct 13, 1964
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL