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| All Patents in class 241/281 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 475,881 | May 31, 1892 | W. Merrill | Machine for creating wood chips | ||
| 1,538,066 | May 19, 1925 | L.H. Street | Pulpwood Chipping Machine | ||
 | 2,053,505 | Sep. 08, 1936 | C.A. Waterous | Magazine grinder | |
| 3,815,763 | Jun. 11, 1974 | G.A. Bilocq, E.P. Hooper | Grinder feeding system | ||