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| All Patents in class 173/96 | |||||
| Picture | Number | Date | Patentee | Title | |
![]() | 1,252,374 | Jan. 01, 1918 | G.H. Gilman | Drilling Machine | |
![]() | 2,678,636 | May 18, 1954 | G.H. Fuehrer | Air hammer with selective drill steel rotation | |