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| All Patents in class 241/89.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,268,860 | Jan. 06, 1942 | H.N. Edens, C.B. Molter | Limestone pulverizer | ||
| 2,732,138 | Jan. 24, 1956 | M.W. Forth | Hammermill | grist mills | |