(under subclass 246) Subject matter in which the return of the circuit-controller to normal condition is retarded after the passage of the train, usually for a predetermined interval of time.
SEE OR SEARCH THIS CLASS, SUBCLASS:
108+, for time-control mechanism.
161, for time-control mechanism used in interlocking.
SEE OR SEARCH CLASS
200, Electricity: Circuit Makers and Breakers,
33+, for retarded-action circuit closers and breakers.
