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| All Patents in class 241/151 | |||||
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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 | |
| 202,097 | Apr. 09, 1878 | W.A. Doane | Improvement in machines for making paper-pulp from wood | paper making machines | |
| 403,653 | May 21, 1889 | F. Dilts | Wood Pulp Machine | wood grinding machines | |