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| All Patents in class 242/413.7 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,662,660 | Mar. 13, 1928 | H.C. Clay | Controller for Variable Speed Transmission | industrial machine speed and direction changing mechanisms | |
| 1,663,493 | Mar. 20, 1928 | H.C. Clay | Control for Variable Speed Mechanism | industrial machine speed and direction changing mechanisms | |
| 3,977,621 | Aug. 31, 1976 | H.W. Huffman | Differential driven rewinder-unwinder | ||