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| All Patents in class 408/209 | |||||
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| Number | Date | Patentee | Title | Type | |
| 77,819 | May 12, 1868 | C. Krebs | Improvement in countersinks | countersinks | |
| 86,674 | Feb. 09, 1869 | L.H. Hunt | Improvement in Countersink | countersinks | |
| 101,796 | Apr. 12, 1870 | A. Wheeler | Improved Countersink | countersinks | |
| 106,168 | Aug. 09, 1870 | W.A. Ives | Improvement in Bung Borer | cooper | |
| 126,963 | May 21, 1872 | L.H. Hunt | Improvement in Countersinks | countersinks | |
| 5,658,102 | Aug. 19, 1997 | R.D. Gale | Hole Saw Arbor Method and Apparatus | mandrels and arbors | |