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| All Patents in class 475/207 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,611,042 | Dec. 14, 1926 | M.K. Akers, H.L. Johnston | Variable-speed mechanism | ||
| 1,758,656 | May 13, 1930 | G.W. Emrick | Tapping attachment | tapping heads and chucks | |
| 2,774,250 | Dec. 18, 1956 | K.F. Gallimore | Multi Speed Transmission for Machine Tools | metalworking power transmission | |