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| All Patents in class 474/71 | |||||
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| Number | Date | Patentee | Title | Type | |
| 252,231 | Jan. 10, 1882 | H. Loed | Mechanical Movement | industrial machine speed and direction changing mechanisms | |
| 495,296 | Apr. 11, 1893 | J.W. Boynton | Speed Regulating Device for Lathes | metalworking speed changing mechanisms | |