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| All Patents in class 92/2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,252,374 | Jan. 01, 1918 | G.H. Gilman | Drilling Machine | ||
| 2,616,323 | Nov. 04, 1952 | L.A. Leifer | Power Actuated Wrench | metal lathe accessories and attachments | |