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| Patents for C. H. Duell | |||||
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| Number | Date | Patentee | Title | Type | |
| 288,376 | Nov. 13, 1883 | G.N. Stearns | Saw-clamp | saw vises | |
| 294,097 | Feb. 26, 1884 | S. Van Auken | Mortise-cleaner | mortising machines | |
| 319,942 | Jun. 09, 1885 | H. Watkins | Spoke driving and tenoning machine | wheelwright | |
| 365,019 | Jun. 14, 1887 | C.T. Phillips | Pipe Wrench | pipe wrenches | |
| 396,223 | Jan. 15, 1889 | H.A. Moyer | Spring-vehicle | ||
| 409,455 | Aug. 20, 1889 | J.J. Cowell | Miter machine | miter boxes | |
| 410,847 | Sep. 10, 1889 | H.A. Moyer | Spring-vehicle | ||