| Patents for Pneumatic Drop Hammer Co. |
Patents 1 -
10
of 10
      |
| Picture | Number | Date | Patentee | Title |
 | 1,722,506 | Jul. 30, 1929 | H.G. Sahlin | Drop hammer |
 | 1,924,545 | Aug. 29, 1933 | W.H. Fitzgerald, R.P. Fitzgerald | Drop hammer |
 | 1,990,478 | Feb. 12, 1935 | R.P. Fitzgerald | Drop hammer |
 | 2,206,812 | Jul. 02, 1940 | W.H. Fitzgerald, R.P. Fitzgerald | Drop hammer die and method of forming same |
 | 2,220,037 | Oct. 29, 1940 | R.P. Fitzgerald | Double-acting drop hammer |
 | 2,263,680 | Nov. 25, 1941 | W.H. Fitzgerald, R.P. Fitzgerald | Drop hammer |
 | 2,449,647 | Sep. 21, 1948 | R.P. Fitzgerald | Drop hammer |
 | 2,612,868 | Oct. 07, 1952 | R.P. Fitzgerald | Pneumatic drop hammer |
 | 2,744,315 | May 08, 1956 | R.P. Fitzgerald | Method and apparatus for die-forging articles from blanks of normally rigid material |
 | 2,942,503 | Jun. 28, 1960 | R.P. Fitzgerald | Power operated hammers |
