US Patent: 413,961
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| Pipe Wrench
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Patentee:
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| Daniel R Porter (exact or similar names) - Chelsea, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 15, 1889 |
| Granted: |
Oct. 29, 1889 |
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Patent Pictures:
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Daniel R. Porter patent October 29, 1889 |
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Stan Schulz
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Description: |
| A spring-loaded lever at the base of movable jaw has teeth engaging a rack on the main shank to hold the adjustment.
Corresponding Canadian patent no. CA-31,072 was granted April 9, 1889. |
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