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| All Patents in class 403/119 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 471,328 | Mar. 22, 1892 | G.W. Pelton | Crank Handle | ||
 | 981,315 | Jan. 10, 1911 | G.E. Rogers | Means for preventing frictional drag on rotating screw-heads | |
 | 1,455,042 | May 15, 1923 | F. Buck | Joint for folding rules | |
 | 1,965,230 | Jul. 03, 1934 | H.M. Gasstrom | Hinge Joint for Folding Rules | |
 | 5,979,521 | Nov. 09, 1999 | J.E. Garcia | Adjustment mechanism | |