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| All Patents in class 241/279 | |||||
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| Number | Date | Patentee | Title | Type | |
| 242,308 | May 31, 1881 | T. Hanvey | Apparatus for grinding wood pulp | manufacturing paper | |
| 293,235 | Feb. 12, 1884 | G.F. Evans | Machine for Reducing Wood Pulp and Fiber | wood grinding machines | |
| 3,194,287 | Jul. 13, 1965 | D.A. Meeker | Food cutting apparatus | ||