| All Patents in class 91/20 |
Patents 1 -
5
of 5
      |
| Number | Date | Patentee | Title | Type |
| 675,528 | Jun. 04, 1901 | R.A. Rutherford | Valve Device for Pneumatic Hoists | industrial valves |
| 1,087,799 | Feb. 17, 1914 | W.H. Snow, L.F. Massey | Elastic-fluid hammer | steam hammers |
| 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 |
