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| All Patents in class 241/257.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 309,189 | Dec. 16, 1884 | J.C. Blevney | Machine for pulverizing ores, &c. | ||
| 1,727,417 | Sep. 10, 1929 | G.M. Soule | Material-treating machine | food and drink mixers | |
| 1,764,700 | Jun. 17, 1930 | W.H. Piesse, M.H. Spielman | Material-treating machine | food and drink mixers | |
| 1,764,760 | Jun. 17, 1930 | G.M. Soule | Material-treating machine | food and drink mixers | |
| 2,212,883 | Aug. 27, 1940 | F.D. Houser, D.A. Meeker | Food handling device | ||