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| All Patents in class 74/469 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 7,971X | Jan. 23, 1834 | T.W. Lafetra | Lever power | ||
| 755,734 | Mar. 29, 1904 | T. Barrow | Valve Operating Mechanism | ||
| 2,107,074 | Feb. 01, 1938 | E.S. Hineline | Copy Camera Equipment Unit | ||