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| Patents for Northwestern Mfg. & Car Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 270,743 | Jan. 16, 1883 | W.A. Clarke | Exhaust-nozzle for steam-engines | |
 | 270,744 | Jan. 16, 1883 | W.A. Clarke | Cut-off valve | |
 | 270,875 | Jan. 16, 1883 | W.A. Clarke | Steam-engine cylinder | |
 | 272,648 | Feb. 20, 1883 | W.A. Clarke | Reversing-gear for steam-engines | |
 | 278,223 | May 22, 1883 | W.A. Clarke | Water-gage | |
 | 286,906 | Oct. 16, 1883 | W.A. Clarke | Traction-engine | |
 | 305,165 | Sep. 16, 1884 | J.H. Elward | Drop-hammer | |