Thanks all for starting to clear up the 112V DC "mystery" (mystery for me, that was).
Still curious where and when it started, and when it died out (design-wise, I mean .... GPU-wise it would have died 30 or so years later, when the last aircraft using it went out of service).
In my case I started my "career" on Concorde, which uses a small turbine on the accessories gearbox, driven by compressed air from a ground unit, then for the other engine in the same nacelle by a crossfeed of HP air. So no electric starter motors, and no 112V DC.