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| All Patents in class 241/220 | |||||
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| Number | Date | Patentee | Title | Type | |
| 689,144 | Dec. 17, 1901 | E.E. Thomas | Edging or other refuse grinder | wood grinding machines | |
| 887,047 | May 05, 1908 | J.N. Lewis, C. Stecher | Pulverizer | ||
| 1,114,031 | Oct. 20, 1914 | G.M. Pelton | Wood Chipping Machine | wood grinding machines | |