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US Patent: 451,792
Wrench
Patentees:
Frederick M. Wirtz - Columbus, OH
John Wirtz - Columbus, OH

USPTO Classifications:
81/127

Tool Categories:
wrenches : wrench adjustment types : self-adjust wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
F. H. Schott
E. J. Fenwick
Valentine Schmitt
Joe Durtpaler

Patent Dates:
Applied: Jun. 03, 1890
Granted: May 05, 1891

Patent Pictures:
Frederick M. Wirtz and John Wirtz patent May 5, 1891
USPTO pdf tiff
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Description:
Self-adjusting sliding jaw with gear teeth that mesh with gear teeth on the handle.

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