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| All Patents in class 241/38 | |||||
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| Number | Date | Patentee | Title | Type | |
| 183,155 | Oct. 10, 1876 | J.O. Gregg | Wood-Grinders for Paper Pulp | paper making machines | |
| 887,047 | May 05, 1908 | J.N. Lewis, C. Stecher | Pulverizer | ||
| 1,182,879 | May 09, 1916 | S.H. Whitten | Pulp-grinding machines | wood grinding machines | |
| 2,880,941 | Apr. 07, 1959 | S.O. Thomas, G.B. Fox | Rotor actuated flushing water control for waste disposer | ||
| 3,344,996 | Oct. 03, 1967 | T.F. Meyers | Food waste disposer and control therefor | ||