US Patent: 1,174,764
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| Wrench
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| USPTO Classifications: |
| 81/68 |
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Patent Dates:
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| Applied: |
May 20, 1914 |
| Granted: |
Mar. 07, 1916 |
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Patent Pictures:
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1 | 2
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Frank R. Riesenberg patent March 7, 1916 |
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Description: |
| The patent is a refinement of Riesenberg's Dec. 16, 1913 patent (no. 1,081,700). The piece connecting the handle and chain is modified and the notch that holds the chain is strengthened and shaped to match the chain links. The wrench was put on the market in 1915, marked with the Dec. 16, 1913 patent. |
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