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| All Patents in class 198/666 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,138,576 | Nov. 29, 1938 | S.C. Gebert | Conveyor Feed Screw | conveyors and hoppers | |
| 2,394,163 | Feb. 05, 1946 | S.C. Gebert | Sectional Screw Conveyer | conveyors and hoppers | |