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| All Patents in class 241/97 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,813 | Oct. 10, 1840 | R. Daniels | Machine for reducing worn-out cloths and silks of various kinds to the fibrous state, so as to be capable of being manufactured into cloth | |
 | 5,143 | Jun. 05, 1847 | A. Barber | Mill for Grinding | |
 | 2,406,904 | Sep. 03, 1946 | F.W. Roberts | Wood Grinding Machine | |
 | 4,934,614 | Jun. 19, 1990 | H.H. Lewis | Rotary grinding apparatus with secondary grinding chamber section | |