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| Patents for Donald E. Herfurth | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,938,411 | May 31, 1960 | D.E. Herfurth | Support Arrangement for Electric Drills | portable metal drilling machines | |
| RE26,037 | Jun. 14, 1966 | D.E. Herfurth | Electromagnetic Drill Unit | portable metal drilling machines | |