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| All Patents in class 408/58 | |||||
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| Number | Date | Patentee | Title | Type | |
| 114,953 | May 16, 1871 | R. Little | Improvement in boring-machines | drilling and boring | |
| 180,976 | Aug. 08, 1876 | P.H. Wilms | Improvement in boring-machines | wood drilling and boring | |
| 2,412,937 | Dec. 24, 1946 | E.A. Allen | Boring head | boring heads | |