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| Patents for Marvin S. Otis | |||||
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| Number | Date | Patentee | Title | Type | |
| 144,354 | Nov. 04, 1873 | M.S. Otis, M.E. Otis | Improvement in wood-grinders for paper-pulp | wood grinding machines | |
| 269,451 | Dec. 19, 1882 | M.S. Otis | Stone Cutting Machine | stone cutting machines | |