Dog bone wrenches

Above, my aluminum dog bone bicycle wrench made by Verma in Western Germany.  (That company seems to have specialized in bicycle tools, such as the "Pedalspanner" below from an ebay auction):

Dog bone wrenches were made by a lot of small companies.  Two examples below from the May 1955 issue of The Family Handyman:

My best dog bone wrench is, or was, made under the Craftsman label.  I bought mine several years ago out of a "discontinued" bin at Sears.  It even has a rare-earth magnet built into it so you can stick it onto a metal surface.  I hardly ever use it, but I like its design with the rotating sockets.