As all the ranges I know have a neutral as well I suppose all the auxiliary stuff runs on 230V.
Maybe also a 230V lamp hooked up with a resistor, but I don't think so. The cable emerging our ranges (flex) are always 5 wire (Don't know about 1950ies and so stuff), 3 phases, neutral and ground, wired into a box with special cover with 5 strip connectors and strain relief. (It's a metal frame with the electrical stuff mounted on that's put into the box, and then a blank cover with a hole for the cord goes on)
