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| All Patents in class 173/103 | |||||
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| Number | Date | Patentee | Title | Type | |
| 59,940 | Nov. 27, 1866 | J.G. Alleyne | Forging Apparatus | steam hammers | |
| 1,252,375 | Jan. 01, 1918 | G.H. Gilman | Drilling Apparatus | ||
| 3,269,466 | Aug. 30, 1966 | W.G. Mitchell | Impact tool | impact chisels and drills | |