(under subclass 131) Subject matter having devices for indicating the position or motion of a distant switch, signal, or similar movable element.
SEE OR SEARCH THIS CLASS, SUBCLASS:
107, 124, 135, 137, 141, 142, 162, 176, 217, 220, 253, and 476, for other switches and signals provided with indicating means.
SEE OR SEARCH CLASS
340, Communications: Electrical,
825+, for electric selective-signaling systems of general application, subclass 298 for signal box type signaling systems having answer back provision, and subclasses 313+ for answer-back-electric signaling systems.
346, Recorders, appropriate subclasses for recorder systems and recorders.
