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| All Patents in class 241/78 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,950,501 | Mar. 13, 1934 | J.J. MacKay | Rock crushing plant | ore processing apparatus | |
| 2,210,093 | Aug. 06, 1940 | S.J. Morrissey | Material handling device | ||