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| All Patents in class 241/284 | |||||
| Number | Date | Patentee | Title | Type | |
| 309,188 | Dec. 16, 1884 | J.C. Blevney | Machine for pulverizing ores, &c. | ||
| 309,189 | Dec. 16, 1884 | J.C. Blevney | Machine for pulverizing ores, &c. | ||
| 2,223,260 | Nov. 26, 1940 | D.A. Meeker | Coffee mill | coffee mills | |