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| All Patents in class 221/243 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,807,941 | Jun. 02, 1931 | E.B. Stimpson, J.F. Suessle | Feeding mechanism for riveting machines | riveting machines | |
| 3,095,119 | Jun. 25, 1963 | H. Gill | Conveyor Mechanism | workpiece changers and storage mechanisms | |