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| All Patents in class 241/252 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,903X | Jan. 18, 1832 | J. Bogardus | Universal mill for grinding paint, grain, etc. | miller | |
| 1,739 | Aug. 25, 1840 | T.J. Wells | Machine for grinding apples and other fruit | food grinders | |