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| All Patents in class 408/183 | |||||
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| Number | Date | Patentee | Title | Type | |
| 13,998 | Dec. 25, 1855 | J.P. Rollins | Extension-Bit | adjustable drill bits | |
| 442,827 | Dec. 16, 1890 | C.P. Russell | Screw-cutting die | taps and dies | |
| 3,724,965 | Apr. 03, 1973 | G.C. Green | Double Bladed Cutting Tool | drilling and boring tool holders | |
| 3,767,317 | Oct. 23, 1973 | R.M. Ortlieb | Double Bladed Cutting Tool | drilling and boring tool holders | |