Yep, exactly. The switched type was commonly used for vacuum cleaners and these nice heaters with a heating coil in the center of a parabolic metal reflector. Sometimes the bar was square instead of round, and I even saw one with a small key switch. Made the connector even bigger. I think this type of connector was used well into the 1970ies until the IEC connector came up. I remember some rather new electric kettles with that connector.
A nice point is that the side grounding was indeed connected directly to the metal casing of the appliance. So there's no problem grounding an older appliance. You just use a grounded cord.
User decides whether it is a class 0 or class 1 device.
