US Patent: 972,052
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| Wrench
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Patent Dates:
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| Applied: |
Sep. 30, 1909 |
| Granted: |
Oct. 04, 1910 |
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Patent Pictures:
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1 | 2
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John Boulieu patent October 4, 1910 |
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Description: |
| Parallelogram self-adjusting wrench with spring to close jaws, and motion limit stop to prevent jaws from going past "full open."
It is an obvious improvement to patent no. 933,096, but the earlier patent is not noted in the specifications. Known examples also indicate a July 12, 1910 Canadian patent. |
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