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| All Patents in class 241/251 | |||||
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| Number | Date | Patentee | Title | Type | |
| 817,610 | Apr. 10, 1906 | D.L. Adelsperger | Mill | grinding mills | |
| 842,681 | Jan. 29, 1907 | G.H. Mayne | Cob Breaker or Crusher | grinding mills | |
| 905,492 | Dec. 01, 1908 | L.E. Bauer | Attrition-Mill Plate | grinding mills | |