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| All Patents in class 226/41 | |||||
| Number | Date | Patentee | Title | Type | |
| 1,545,638 | Jul. 14, 1925 | H.C. Clay | Automatic Speed Regulation | industrial machine speed and direction changing mechanisms | |
| 1,662,660 | Mar. 13, 1928 | H.C. Clay | Controller for Variable Speed Transmission | industrial machine speed and direction changing mechanisms | |