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| All Patents in class 72/453.14 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,744,315 | May 08, 1956 | R.P. Fitzgerald | Method and apparatus for die-forging articles from blanks of normally rigid material | drop hammers | |
| 2,942,503 | Jun. 28, 1960 | R.P. Fitzgerald | Power operated hammers | drop hammers | |