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| Patents for John F. Den Herwiel | |||||
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| Number | Date | Patentee | Title | Type | |
| 598,304 | Feb. 01, 1898 | I.A. Cunningham | Wrench | angle adjustable wrenches | |
| 603,305 | May 03, 1898 | M. Weiss | Wrench | wrench combination tools | |