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| All Patents in class 241/73 | |||||
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| Number | Date | Patentee | Title | Type | |
| 424,602 | Apr. 01, 1890 | E.C. Engelberg | Rice-hulling machine | ||
| 512,304 | Jan. 09, 1894 | C.E. Lipe | Hulling-machine | ||
| 2,279,219 | Apr. 07, 1942 | L.R. Baker, A.D. Baker | Material Grinding Machine | material grinding machines | |
| 4,934,614 | Jun. 19, 1990 | H.H. Lewis | Rotary grinding apparatus with secondary grinding chamber section | wood grinding machines | |