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| All Patents in class 403/303 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 17,236 | May 05, 1857 | W. Sellers, C. Sellers | Improvement in couplings for shafting | |
 | 64,292 | Apr. 30, 1867 | J.W. Douglas | Improvement in hose-couplings | |
 | 318,975 | Jun. 02, 1885 | C.E. Gee | Shaft-coupling | |
 | 320,439 | Jun. 16, 1885 | E.D. Mackintosh | Shaft-couplings | |
| 1,954,048 | Apr. 10, 1934 | S.C. Moon, R.K. Jeffery | Tool Holder | ||