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| All Patents in class 74/330 | |||||
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| Number | Date | Patentee | Title | Type | |
| 213,338 | Mar. 18, 1879 | S.D. Locke | Variable Speed Gearing | industrial machine speed and direction changing mechanisms | |
| 707,890 | Aug. 26, 1902 | W.A. Wood | Variable-speed clutch | industrial machine clutches | |
| 2,856,044 | Oct. 14, 1958 | M.W. Hazelton, H.F. Koenig, III | Automatic shift two-speed press brake | sheet metal brakes | |