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| All Patents in class 408/196 | |||||
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| Number | Date | Patentee | Title | Type | |
| 49,336 | Aug. 08, 1865 | W. Brodhead | Improvement in boring-tool | adjustable drill bits | |
| 182,744 | Oct. 03, 1876 | J. Bowen | Bung Cutter | bung making machines | |
| 438,230 | Oct. 14, 1890 | J.G. Erd | Flue Hole Cutter | boilermaker | |
| 1,048,792 | Dec. 31, 1912 | J.G. Baker | Boring, Turning and Planing Tool | wood drilling and boring | |
| 1,702,485 | Feb. 19, 1929 | O. Severson | Adjustable Counterbore | metalworking counterbores | |
| 1,939,490 | Dec. 12, 1933 | J.O. Dixon | Compound tool | ||