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US Patent: 933,096
Wrench
Patentee:
William Hilliard Munro - Sault Ste. Marie, ON Canada

USPTO Classifications:
81/117, 81/185.2

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

Assignees:
None

Manufacturer:
Lake Superior Wrench Co. - Sault Ste. Marie, MI
Superior Wrench Co. - Marshalltown, IA

Witnesses:
J. E. Boyce
H. Young
B. Boyd
R. Cobain

Patent Dates:
Applied: Mar. 25, 1908
Granted: Sep. 07, 1909

Patent Pictures: [ 1 | 2 ]
William Hilliard Munro patent September 7, 1909
USPTO pdf tiff
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Description:
Parallelogram action self-adjusting wrench. Compare to the ELLRICH based on patent no. 366,246 (July 12, 1887).

Produced as the LAKE SUPERIOR (later SUPERIOR) wrench; a small size was given away as a premium with several farm magazine subscriptions.

Improved by pat no. 972,052, issued Oct. 4. 1910.

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