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| All Patents in class 241/80 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 204,945 | Jun. 18, 1878 | H. Bolthoff | Improvement in pulverizing apparatus | |
| 1,950,501 | Mar. 13, 1934 | J.J. MacKay | Rock crushing plant | ||
| 2,117,300 | May 17, 1938 | J. Corser | Rock crushing machine | ||
| 2,256,731 | Sep. 23, 1941 | G.C. Winther | Means for forming and segregating rock chips from aggregates | ||
 | 4,934,614 | Jun. 19, 1990 | H.H. Lewis | Rotary grinding apparatus with secondary grinding chamber section | |