US Patent: 678,960
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| Pipe Wrench
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Patentees:
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| Joseph P. Lavigne (exact or similar names) - New Haven, CT |
| Albert W. Johnson (exact or similar names) - New Haven, CT |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 19, 1901 |
| Granted: |
Jul. 23, 1901 |
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Patent Pictures:
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Patent 678,960 - edited image |
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Stan Schulz
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Description: |
| Singing hook jaw pipe wrench, with a "retaining spring" inset in the pivot of the hook jaw. The bar has several slots to allow for size adjustment.
A. W. Johnson - patent attorney |
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