(under subclass 79) Devices wherein the fluid-operated motor is controlled by an electrically-operated relay-valve, which is in turn controlled by the means responsive to the temperature to be regulated. The electric device must actually operate the relay-valve at least in one direction.
SEE OR SEARCH THIS CLASS, SUBCLASS:
79, for means where power for operating the relay-valve is stored up by action of the motor and this is released by electric means.
