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| All Patents in class 241/228 | |||||
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| Number | Date | Patentee | Title | Type | |
| 90,429 | May 25, 1869 | R. Daniels | Improved vegetable-crusher | ||
| 263,548 | Aug. 29, 1882 | T. Lowry | Grinding Apparatus | food grinders | |
| 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 | |