Here is the first book ever to identify and describe the makers of one of the most mechanically intriguing of all tools, the wrench. The author includes hundreds of makers; each listing shows the maker's location, history, period of operation and known products. There is, as well, a Wrench Identification section that cross-references patent dates and trade names (frequently the only marking on a wrench) to the actual maker. As with Cope's previous pioneering works on American machinist's tools and their makers, this volume provides an extremely comprehensive historical directory of this fascinating tool and its underlying technology. It is a truly unique reference source for collectors, dealers, and researchers.