US Patent: 181,990
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| Improvement in Tubing-Chain Wrenches
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Patentee:
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| Orlando H. Smith (exact or similar names) - Kane City, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 26, 1875 |
| Granted: |
Sep. 05, 1876 |
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Patent Pictures:
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Orlando H. Smith Pat. September 5, 1876 |
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Stan Schulz
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Description: |
| Two gripping surfaces on a hook, and a reversible dog on a block, together with an intermediate length of chain, form a wrench to tighten or loosen lengths of drill stem pipe. |
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