US Patent: 171,550
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| Screw Wrench
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Patent Dates:
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| Applied: |
Jun. 19, 1871 |
| Granted: |
Dec. 28, 1875 |
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Patent Pictures:
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John H. Coes Pat. Dec. 28, 1875 |
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Description: |
| The patent is for the relative arrangement of the reinforced wrench-bar, sliding jaw, and operating screw. It includes the "jog bar" on the back of the wrench bar. The specifications mention a back reinforcing rib like the Dec. 12, 1865 Lindsay patent (no. 514,65). The patent specifically cites the Richard patent no 27,090.
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