Yes, would be very interesting to set them side-by-side with Fairmount/Martins - I'm gonna go out on a limb (if nobody else has already) and guess that Mac sourced theirs from F/M, since they've sourced so much from so many others at some point. Could even toss Cornwell into the comparison mix. What was it about these early Ohio based tool companies - Fairmount (Cleveland, later bought by Martin Sprocket), Mac (Sabina), Cornwell (Mogadore), Vanadium (Athens)....
Geez, might even have to throw Wright (Barberton) into the mix too. Can OH born wrenches not keep their pants zipped?!