US Patent: 203,581
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| Wrench
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Patentee:
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| John S. Birch (exact or similar names) - Orange, NJ |
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Patent Dates:
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| Applied: |
Nov. 27, 1877 |
| Granted: |
May 14, 1878 |
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Patent Pictures:
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1 | 2
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John S. Birch patent May 14, 1878 |
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Stan Schulz
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Description: |
| The tool is a "T" handle, push button adjusting watch key or nut wrench. The patent has provision for an adjustment lock.
This was advertised as Birch's Automatic Wrench, with some significant modifications from this patent.
Birch's watch key was based on pat. no. 88,836; later versions conforming to patent no. 282,605 are also found. |
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