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| All Patents in class 74/507 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 258,533 | May 23, 1882 | G.T. Reiss, A. Gordon | Adjusting-gearing | |
| 2,453,656 | Nov. 09, 1948 | E.P. Bullard | Rack and Pinion Gear Means | ||