| All Patents in class 91/39 |
Patents 1 -
9
of 9
      |
| Picture | Number | Date | Patentee | Title |
 | 230,611 | Aug. 03, 1880 | J.C. Butterfield | Stamp-mill |
| | 605,169 | Jun. 07, 1898 | A.J. Loretz | Hydraulic Motor Regulating Device |
| | 731,872 | Jun. 23, 1903 | F.G. Echols | Motor Mechanism |
 | 1,268,270 | Jun. 04, 1918 | R.W. Nazel | Fluid-power hammer |
 | 2,202,256 | May 28, 1940 | O.M. Jensen, F.T. Wruk, T.W. Whitley | Hydraulic feed for power driven hack saws |
 | 2,300,047 | Oct. 27, 1942 | O.M. Jensen, F.T. Wruk, J.R. McDonald | Hydraulically controlled metal hack saw |
 | 2,560,449 | Jul. 10, 1951 | V.R. Noll, M. Kahr | Free piston engine |
| | 2,573,368 | Oct. 30, 1951 | E.Y. Seborg | Reciprocatory drive for machine tools |
| | 2,660,985 | Dec. 01, 1953 | H. Ernst | Hydraulic Feed System |
