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| All Patents in class 198/550.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,092,248 | Sep. 07, 1937 | B.M. Guthrie | Material Conveying Device | conveyors and hoppers | |
| 2,807,832 | Oct. 01, 1957 | B.H. Davis | Stock feed control for extrusion apparatus | wire insulating machines | |