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US Patent: 972,052
John Boulieu - Sault Ste. Marie, MI

USPTO Classifications:

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

John Boulieu - Sault Ste. Marie, MI
James B. Ryan - Sault Ste. Marie, MI

Lake Superior Wrench Co. - Sault Ste. Marie, MI

Juana M. Fallin
W. N. Woodson
J. H. Newhouse
Alice Boulieu

Patent Dates:
Applied: Sep. 30, 1909
Granted: Oct. 04, 1910

Patent Pictures: [ 1 | 2 ]
John Boulieu patent October 4, 1910
USPTO pdf tiff
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Parallelogram self-adjusting wrench with spring to close jaws, and motion limit stop to prevent jaws from going past "full open."

It is an obvious improvement to patent no. 933,096, but the earlier patent is not noted in the specifications. Known examples also indicate a July 12, 1910 Canadian patent (pat. no. CA-126,847).

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