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| All Patents in class 241/32 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 357,767 | Feb. 15, 1887 | C.G. Freeman | Grinding Mill | ||
| 471,345 | Mar. 22, 1892 | D.C. Stover | Grinding Mill | ||
| 786,293 | Apr. 04, 1905 | H.L. Johnston | Coffee grinder | ||
| 842,681 | Jan. 29, 1907 | G.H. Mayne | Cob Breaker or Crusher | ||
 | 855,099 | May 28, 1907 | A.M. Dellinger | Vertical-disk grinding-mill | |
| 864,786 | Sep. 03, 1907 | H.L. Johnston | Driving mechanism | ||
| 1,291,534 | Jan. 14, 1919 | H.L. Johnston | Coffee-grinder | ||
| 1,502,675 | Jul. 29, 1924 | H.L. Johnston | Grinder for coffee and the like | ||