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| All Patents in class 198/532 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 730,920 | Jun. 16, 1903 | P.J. Joecken | Feeding apparatus for wood strips | |
| 1,237,334 | Aug. 21, 1917 | C.L. Heisler | Comminuted Fuel Feeding Apparatus | ||
| 2,117,300 | May 17, 1938 | J. Corser | Rock crushing machine | ||
| 3,815,763 | Jun. 11, 1974 | G.A. Bilocq, E.P. Hooper | Grinder feeding system | ||