US Patent: 623,800
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| Wrench
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Patentee:
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| James L. Martin (exact or similar names) - Marion Center, PA |
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Patent Dates:
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| Applied: |
Dec. 03, 1898 |
| Granted: |
Apr. 25, 1899 |
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Patent Pictures:
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1 | 2
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James L. Martin patent April 25, 1899 |
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Stan Schulz
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Description: |
| The jaws tend to spring apart and the screw and thumb nut close them. The rigidity of the spring prongs that form the jaws mean they resist any tendency to spring or twist sideways.
A known example is approx. 7 1/2 inches long overall, and is marked with the patent date. |
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