US Patent: 612,924
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| Expansion Bit Stock Wrench
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Patentee:
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| Peter S. Grenier (exact or similar names) - Pawtucket, RI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 16, 1898 |
| Granted: |
Oct. 25, 1898 |
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Patent Pictures:
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Peter S. Grenier patent October 25, 1898 |
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Stan Schulz
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Description: |
| Spiral grooves in the outer shell engage pins on the jaw halves to adjust the socket size. A thumb screw in the shell clamps the shell to the base for the jaws to hold the adjustment. |
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