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| All Patents in class 198/670 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 383,556 | May 29, 1888 | A.H. Brainard | Conveyer | |
| 2,225,215 | Dec. 17, 1940 | B.M. Guthrie | Stoker | ||
| 2,807,832 | Oct. 01, 1957 | B.H. Davis | Stock feed control for extrusion apparatus | ||