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| All Patents in class 241/33 | |||||
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| Number | Date | Patentee | Title | Type | |
| 682,157 | Sep. 10, 1901 | D.L. Adelsperger | Grinding or Crushing Mill. | grinding mills | |
| 1,182,879 | May 09, 1916 | S.H. Whitten | Pulp-grinding machines | wood grinding machines | |
| 1,696,636 | Dec. 25, 1928 | H.L. Johnston | Grinding apparatus | ||
| 3,344,996 | Oct. 03, 1967 | T.F. Meyers | Food waste disposer and control therefor | ||