| All Patents in class 91/4R |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 637,461 | Nov. 21, 1899 | J. Hartness | Fluid Operated Lathe | metal lathes |
| 789,556 | May 09, 1905 | G.C. Marx | Electric switch | |
| 833,632 | Oct. 16, 1906 | W.H. Ridgway | Steam hydraulic hoist | hoists, winches, come-alongs |
| 1,036,842 | Aug. 27, 1912 | C.L. Heisler | Valve Reversing Gear | steam engine valve gear |
| 1,931,652 | Oct. 24, 1933 | R.E. Flanders | Hydraulically Operated Feed Mechanism for High Speed Machines | hydraulic apparatus |
| 2,979,903 | Apr. 18, 1961 | L.R. Beck | Air-hydraulic apparatus | hydraulic apparatus |
