US Patent: 640,530
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| Wrench
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Patentee:
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| Johann L. Braun (exact or similar names) - Pittsburg, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 31, 1899 |
| Granted: |
Jan. 02, 1900 |
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Patent Pictures:
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Johann L. Braun patent January 2, 1900 |
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Stan Schulz
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Description: |
| Self-adjusting design where double jaws slide toward or away from each other on a guide bar. The adjusting motion is provided by links to a handle that pivots on the guide bar. |
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