Clinton E. Smith (oddly, of Milwaukie, Oregon, home of P&C Tools) patented my pliers in 1934, explicitly for BX armored cable. You can read the patent description if you want, but basically, that counterbore is recessed inside to form the conduit, and the tips are designed to shape the ends with a little pressure and ultimately cut the cable without de-forming it.
AA has a Utica marked example, also marked “S.P.A.C.”, an acronym that AA attributes to “Smith’s Patent Armored Cutters.”
If you go to the DATAMP page for Smith’s patent, linked
here, you’ll see that they cite Utica as a manufacturer. They don’t cite Mephisto Tool Co. as a manufacturer, but they are aware of the examples marked Mephisto. Whether or not Utica was making them for the W.A. Ives Company for their “Mephisto” brand or for the Mephisto Tool Company that emerged form the old W.A. Ives Company entity at that time, I do believe that Utica is the OEM, and I believe that Utica is the OEM for JoCo’s slip-joint pliers in post #1 as well, as I postulated upthread, based at that time on the three-diamond pattern grip on the handle that is a Utica tell. These pliers confirm it, in my opinion.
I have not found any connection between Mr. Smith and Utica, W.A. Ives, or Mephisto Tool Company, and I suspect he was licensing the design.
I don’t know when the Mephisto Tool Company emerged from the W.A. Ives Company, or when they moved across the river and downstate from Wallingford, Conn., to Hudson, N.Y., but they surely did. The earliest public domain document I can find that references that name is a 1937 Hardware Age.
JoCo has apparently seen a 1935 Mephisto Tool Company catalog for sale on eBay. That would be helpful to have.
In 1949, forty years after it was originally trademarked in 1909 by W.A. Ives, the Mephisto Tool Company renewed the fancified “
Mephisto” trademark, and in 1989, forty years later, they renewed it again.