US Patent: 657,391
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| Wrench
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Patentee:
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| Thomas H. Brosnihan (exact or similar names) - Livermore Falls, ME |
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Patent Dates:
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| Applied: |
Dec. 15, 1899 |
| Granted: |
Sep. 04, 1900 |
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Patent Pictures:
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1 | 2
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Thomas H. Brosnihan patent Sept. 4, 1900 |
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Stan Schulz
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Description: |
| The key elements of the patent are the hardened pipe-gripping jaw faces. The pipe-gripping jaw face on the adjustable jaw slides on a keyway-shaped base, and is pressed outward by a spring. |
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