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| All Patents in class 241/191 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | FX-7,104 | Jun. 04, 1832 | S. Prentiss | Grist mill, gate pressure | |
| 594,250 | Nov. 23, 1897 | E.W. Silver, C.F. Haldeman | Shredder-cylinder for fodder-mills | ||
| 2,279,219 | Apr. 07, 1942 | L.R. Baker, A.D. Baker | Material Grinding Machine | ||
| 4,172,481 | Oct. 30, 1979 | M.J. Brisson | Flail device | ||
 | 4,934,611 | Jun. 19, 1990 | H.H. Lewis | Rotary grinding apparatus | |