US Patent: D28,487
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| Wrench Jaw
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Patentee:
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| Henry J. Martin (exact or similar names) - Chicago, IL |
| USPTO Classifications: |
| D8/21 |
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Patent Dates:
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| Applied: |
Jun. 23, 1897 |
| Granted: |
Apr. 19, 1898 |
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Patent Pictures:
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Henry J. Martin Pat. April 19, 1898 |
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Stan Schulz
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Description: |
| The piece is roughly triangular, with teeth on two faces. It is the renewable gripping surface for the Whitman & Barnes improved pipe wrench. It evolved from the Frank S. Cook May 19, 1891 wrench jaw patent (no. 452,518) which appears on a "Stillson" type pipe wrench produced by W&B. |
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