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| All Patents in class 241/46.15 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,282,887 | May 12, 1942 | F.W. Roberts | Wood Grinding Machine | wood grinding machines | |
| 2,406,904 | Sep. 03, 1946 | F.W. Roberts | Wood Grinding Machine | wood grinding machines | |