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| All Patents in class 241/142 | |||||
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| Number | Date | Patentee | Title | Type | |
| 471,345 | Mar. 22, 1892 | D.C. Stover | Grinding Mill | grinding mills | |
| 682,157 | Sep. 10, 1901 | D.L. Adelsperger | Grinding or Crushing Mill. | grinding mills | |
| 842,681 | Jan. 29, 1907 | G.H. Mayne | Cob Breaker or Crusher | grinding mills | |