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| All Patents in class 198/671 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,237,334 | Aug. 21, 1917 | C.L. Heisler | Comminuted Fuel Feeding Apparatus | locomotive coal feeding apparatus | |
| 2,807,832 | Oct. 01, 1957 | B.H. Davis | Stock feed control for extrusion apparatus | wire insulating machines | |