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| Patents for Ralph Brewster | |||||
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| Number | Date | Patentee | Title | Type | |
| 17,846 | Jul. 21, 1857 | A. Rickart | Method of turning carriage-hubs | wood lathes | |
| 21,443 | Sep. 07, 1858 | A. Rickart | Machine for turning hubs | wood lathes | |