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| All Patents in class 91/20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 675,528 | Jun. 04, 1901 | R.A. Rutherford | Valve Device for Pneumatic Hoists | industrial valves | |
| 2,525,127 | Oct. 10, 1950 | W.F. Groene, H.J. Siekmann, W.R. Meyer | Hydraulic feed and control mechanism | crankshaft lathes | |
| 2,573,368 | Oct. 30, 1951 | E.Y. Seborg | Reciprocatory drive for machine tools | ||
| 3,807,278 | Apr. 30, 1974 | J.C. Le Veque, M.R. Hicks | Programmable Fluidic Control System for Machine Tools | machine tool controls | |