US Patent: 937,966
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| Wrench
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Patentee:
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| Daniel W. Shaffer (exact or similar names) - Chattanooga, OK |
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Patent Dates:
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| Applied: |
Feb. 23, 1909 |
| Granted: |
Oct. 26, 1909 |
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Patent Pictures:
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Daniel W. Shaffer patent October 26, 1909 |
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Stan Schulz
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Description: |
| Combination pipe and nut wrench with a central adjusting screw in a hollow handle, and parallel guide rods sliding in tubes alongside the handle. One or both ends of the adjusting screw may have a perpendicular rod handle to facilitate tightening the grip of the adjustable jaw.
Similar to the January 3, 1922 Bonnell Sure Grip (patent no. 1,401,956) from Chickasha, Okla. |
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