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US Patent: 481,506
Wrench
Patentee:
Bernard McGilvray (exact or similar names) - Washington, DC

USPTO Classifications:
81/184

Tool Categories:
wrenches : pipe and nut combination wrenches

Assignees:
Bernard McGilvray - Washington, DC
Frederic W. Ritter, Jr. - Washington, DC

Manufacturer:
Not known to have been produced

Witnesses:
F. R. Cornwall
I. M. Cornwall
Percy B. Hills

Patent Dates:
Applied: May 10, 1892
Granted: Aug. 23, 1892

Patent Pictures:
Bernard McGilvray patent August 23, 1892
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Description:
Screw adjusting combination nut and pipe wrench. The adjusting rosette has holes for insertion of a rod for extra leverage. The intermediate jaw piece has pipe gripping teeth on one face, and spring clips to hold it in place when used for gripping pipe.

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