US Patent: 150,301
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| Wrenches
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Patentee:
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| Frank Leo Delfer (exact or similar names) - Burlington, IA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 14, 1874 |
| Granted: |
Apr. 28, 1874 |
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Patent Pictures:
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Frank L. Delfer Pat. April 28, 1874 |
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Stan Schulz
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Description: |
| The patent is for two fixed jaws and a "stop" designed to firmly hold a correspondingly shaped nut; the wrench would have to slide on and off from the side. The wrench is intended to work on axle nuts which typically are recessed in a hub, so it is not clear how this patent could work in a real-world situation. |
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