Mt. Carmel clamp

 Mount Carmel in Connecticut (just outside of New Haven) seems to have been a manufacturing center, there was a Mount Carmel Bolt Co. mentioned in the Lamson & Sessions history and as well as a Mount Carmel Mfg. company that lasted at least into the late 20s- by a couple of ads found online. I would suspect the c clamp came from the manufacturing company rather than the bolt company.