https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=55051&pn=189,213,059 Wrenches Patentees: William Parker Fox - Sheffield England , Thomas Fox - Sheffield England Granted:1892-07-16

Design with adjusting nut in the movable jaw working on a threaded shaft parallel to the main shank; the specifications include description of how the parts are assembled. Ron Geesin's "The Adjustable Spanner" shows two sizes of Fox Bros. DELPHI matching this design. An 1893 ad for Wm. MARPLES "ECLIPSE" lists seven sizes (6" through 18").
This is one of 85,064 patents currently in the database at datamp.org

]]>