It should read THE KEITH WRENCH / KEITH MFG. CO. AURORA, ILL. Patent is on DATAMP at
http://www.datamp.org/patents/advance.php?pn=447952&id=40407&set=1 (http://www.datamp.org/patents/advance.php?pn=447952&id=40407&set=1)
It's in Schulz (No. 684) and there is also a variation with a wooden handle.
Have sold a couple on Wrenching News Auctions including one (Lot 603) on the 2009 Ervin-Matz Auction:
(http://i222.photobucket.com/albums/dd3/buswrench/evrin-matz-2009/ervin-matz-598-607.jpg)
Here a wooden handle example from my collection:
(http://i222.photobucket.com/albums/dd3/buswrench/message-board/keith-wrench.jpg)