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| Patents for B61D 7 - Hopper cars (1,208) |
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| 05/18/1976 | US3956996 Pivoted slide gate lock | | 04/20/1976 | US3951278 Apparatus for unloading bulk material | | 04/20/1976 | US3951077 Railway hopper car door and latch actuating means | | 04/13/1976 | US3949681 Motor actuated railway hopper car door mechanism | | 02/17/1976 | US3938861 Door construction for hopper trailer | | 02/10/1976 | US3937838 Bronchodilators, dihydroxyphenyl ethanolamines | | 01/20/1976 | US3933100 Hopper gate actuating mechanism | | 01/13/1976 | US3931768 Hopper vehicle |
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