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| All Patents in class 408/27 | |||||
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| Number | Date | Patentee | Title | Type | |
| 687,025 | Nov. 19, 1901 | B.E. Hervey | Boring and Drilling Machine | woodworking horizontal borers | |
| 1,475,153 | Nov. 20, 1923 | H. Athenas | Portable electric combination drill | handheld power drills | |
| 1,503,206 | Jul. 29, 1924 | A.W. Ojerholm | Combination valve grinder and drill | valve and seat maintenance | |