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| Patents for William H. J. Fitzgerald | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,924,545 | Aug. 29, 1933 | W.H. Fitzgerald, R.P. Fitzgerald | Drop hammer | drop hammers | |
| 2,206,812 | Jul. 02, 1940 | W.H. Fitzgerald, R.P. Fitzgerald | Drop hammer die and method of forming same | drop hammers | |
| 2,263,680 | Nov. 25, 1941 | W.H. Fitzgerald, R.P. Fitzgerald | Drop hammer | drop hammers | |