| All Patents in class 91/40 |
Patents 1 -
8
of 8
      |
| Picture | Number | Date | Patentee | Title |
| | 517,900 | Apr. 10, 1894 | N. Tesla | Steam-Engine |
| | 1,259,045 | Mar. 12, 1918 | A.L. Proske, T.H. Proske | Drill Sharpener |
| | 1,971,773 | Aug. 28, 1934 | J. De Mooy | Riveting Machine |
| | 1,998,003 | Apr. 16, 1935 | L.F. Nenninger, C.W. Goodrich, H. Ernst | Hydraulic Feed Control |
| | 2,107,108 | Feb. 01, 1938 | J. De Mooy | Rotary Tool |
 | 2,619,072 | Nov. 25, 1952 | E.C. Clarke, Jr., P.A. Rickrode | Drop hammer control |
| | 2,713,246 | Jul. 19, 1955 | H. Fritschi, A.H. Dall | Tracer Control Mechanism Having Independent Rate and Direction Control |
 | 5,715,724 | Feb. 10, 1998 | C.J. Crout, R.N. Harris | Adaptive, self-regulating forging hammer control system |
