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| All Patents in class 241/68 | |||||
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| Number | Date | Patentee | Title | Type | |
| 621X | May 21, 1805 | T.W. Pryor | Bark Mill | bark processing machines | |
| 3,303 | Oct. 12, 1843 | H.H. Evarts | Straw-cutter | hay or straw cutters | |
| 13,385 | Aug. 07, 1855 | D.C. Cumings | Straw-cutter | hay or straw cutters | |
| 515,896 | Mar. 06, 1894 | H. Bolthoff | Mortar for stamp-mills | ore processing apparatus | |
| 682,158 | Sep. 10, 1901 | D.L. Adelsperger | Apparatus for Grinding, Crushing, or Feeding | grinding mills | |