| All Patents in class 72/453.18 |
Patents 16 -
23
of 23
      |
| Number | Date | Patentee | Title | Type |
| 2,220,037 | Oct. 29, 1940 | R.P. Fitzgerald | Double-acting drop hammer | drop hammers |
| 2,263,680 | Nov. 25, 1941 | W.H. Fitzgerald, R.P. Fitzgerald | Drop hammer | drop hammers |
| 2,345,563 | Apr. 04, 1944 | R.L. Alcorn, Jr. | Hydraulically operated drop hammer | drop hammers |
| 2,612,868 | Oct. 07, 1952 | R.P. Fitzgerald | Pneumatic drop hammer | drop hammers |
| 2,647,421 | Aug. 04, 1953 | W.W. Criley | Upsetting Forging Machine | forging machines |
| 2,859,793 | Nov. 11, 1958 | J.L. Ross | Pivotally Mounted Laterally Spaced Fluid Pressure Means for Twisting Crankshafts | metal bending machines |
| 3,142,206 | Jul. 28, 1964 | G.A. Householder, W.W. Hague | Control system for impact device | drop hammers |
| 3,396,570 | Aug. 13, 1968 | W.B. McCardell | Non-Generating Tooth Forming Apparatus | gear making machines |
