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| All Patents in class 241/74 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,982 | Jan. 01, 1850 | J.M. Clark | Combining Grinding and Bolting Machines | miller | |
| 230,611 | Aug. 03, 1880 | J.C. Butterfield | Stamp-mill | ore processing apparatus | |
| 879,175 | Feb. 18, 1908 | F.A. Huntington | Crushing-mill | ore processing apparatus | |
| 1,082,960 | Dec. 30, 1913 | C.C. Lane | Slow-speed Chilian mill | ore processing apparatus | |