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US Patent: 102,753
Watch Key
Improvement in Adjustable Watch-Keys
Patentee:
John S. Birch (exact or similar names) - New York, NY

USPTO Classifications:
279/38, 81/112

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Frank Blockley
James T. Graham
A. W. Almquist
Alex J. Roberts

Patent Dates:
Applied: Jun. 25, 1869
Granted: May 10, 1870

Patent Pictures:
J.S. Birch Pat. May 10, 1870
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Description:
This patent is an improvement on Birch's Nov. 12, 1867 and April 13, 1869 (no. 88,836) patents. A larger version of Birch's self-adjusting watch key with a "T" handle was produced as a self-adjusting socket wrench.

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