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| All Patents in class 241/215 | |||||
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| Number | Date | Patentee | Title | Type | |
| 525,443 | Sep. 04, 1894 | P.W. Gates, E.E. Hanna, C.L. Carman | Gyrating crusher | ore processing apparatus | |
| 1,507,970 | Sep. 09, 1924 | A.A. Lazier | Ore Crusher | ore processing apparatus | |
| 2,556,641 | Jun. 12, 1951 | H.F. Bakewell | Grinder for pigments and other materials | ||