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| Patents for Watts, Campbell & Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 30,549 | Oct. 30, 1860 | W. Watts | Hanger and box for shafting | |
 | 42,054 | Mar. 22, 1864 | W. Watts, F. Willcox, D.F. Tompkins | Improvement in spikes and nails | |