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| All Patents in class 91/424 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,531,490 | Mar. 31, 1925 | W.I. Seymour, G.P. Macready | Pneumatic drop hammer | drop hammers | |
| 1,924,545 | Aug. 29, 1933 | W.H. Fitzgerald, R.P. Fitzgerald | Drop hammer | drop hammers | |