US Patent: 620,143
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| Wrench
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Patentee:
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| Charles Johnson (exact or similar names) - West Superior, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 20, 1898 |
| Granted: |
Feb. 28, 1899 |
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Stan Schulz
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Description: |
| Ratchet open end wrench. The jaws have concealed slots and threads to accommodate a screw-adjusted sliding block that can be used to adjust the opening size or to clamp in an adjustable jaw work holder. |
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