Wrench collectors may find the following resources useful and interesting:
http://www.datamp.org -- Directory of American Tool & Machinery Patents ( as of April 2015 includes nearly 6,000 wrench & pliers patents with information about production, etc. -- including some Canadian and British patents ).
MVWC on Flickr: http://www.flickr.com/photos/mvwcnews/
The "wrench discussion board" at papawswrench is a dynamic place.
Bolt's Antique Tool Museum at Oroville, CA has wrenches as its primary focus. If you are going through northern California, be sure to take time to visit.