After further review found one listed on E-bay in Nov,2011 which was listed in heads up on Tool Talk. It says wrench was made by Wisconsin Stamped Steel Co of Madison,Wi. Cope lists this company as maker of automatic wrenchs in 1909 and 1914 Thomas Register. Patent listed as Mar 28,1911 pat #988142 was issued to Charles Pollock of Corinth,Alcorn Co,Ms. Patent drawing does not look like this wrench but principle may be valid. Don't understand the disparities in various locations mentioned but it is what it is. Hope this is some help in tracking down the history of your wrench.