US Patent: 274,545
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| Wrench
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Patentees:
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| Frank Armstrong (exact or similar names) - Bridgeport, CT |
| John H. Hine (exact or similar names) - Bridgeport, CT |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 30, 1883 |
| Granted: |
Mar. 27, 1883 |
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Patent Pictures:
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Frank Armstrong and John H. Hine patent March 27, 1883 |
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Stan Schulz
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Description: |
| The movable jaw slides, and is held in place by a tooth on the swinging handle that engages a rack on the shank. The spring between the jaw and lever handle keeps the jaw faces parallel. |
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