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| All Patents in class 408/30 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,947,225 | Aug. 02, 1960 | L.J. Heppner | Polygonal Hole Forming Tool | drill bits | |
| 6,176,651 | Jan. 23, 2001 | D.N. Hollinger, A.V. Bondi | Attachment alignment method and apparatus | ||
| 6,238,149 | May 29, 2001 | D.N. Hollinger, A.V. Bondi | Apparatus for drill press | drill presses | |