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