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| All Patents in class 74/473.25 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,024,220 | Apr. 23, 1912 | H.M. Norris | Gearing | metalworking speed changing mechanisms | |
| 3,389,616 | Jun. 25, 1968 | S.E. Farekas | Lever Interlock | ||