US Patent: 523,020
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| Wrench
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Patentee:
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| Carl Tinglof (exact or similar names) - Boston, MA |
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Patent Dates:
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| Applied: |
Feb. 14, 1894 |
| Granted: |
Jul. 17, 1894 |
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Patent Pictures:
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Carl Tinglof patent July 17, 1894 with HARDY and CARTER BOSTON PAT PEND. |
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Stan Schulz
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Description: |
| The frame and adjustable jaw are connected by a central adjusting screw with left- and right-hand threads. Known examples marked "HARDY & CARTER BOSTON. PAT PEND." |
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