US Patent: 110,789
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| Wrench
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Patentee:
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| John F. Robertson (exact or similar names) - Warwick, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 28, 1870 |
| Granted: |
Jan. 03, 1871 |
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Patent Pictures:
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John F. Robertson Pat. Jan. 3, 1871 |
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Stan Schulz
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Description: |
| The adjuster is a slide moved by a screw; the grooves in the adjuster and corresponding ridges on the jaws are slightly angled so that moving the adjuster opens and closes the jaw opening. |
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