(under subclass 3) Systems having means so that any one of a plurality of signals may be independently set or controlled from a distance, the number of line-wires used being less than the number of signals controlled.
SEE OR SEARCH THIS CLASS, SUBCLASS:
156, 157, 164, 165, 424, 425, and 426, for selective mechanism and devices and all subclasses in the titles of which the words "Cab and control" appear, for means for actuating signals on trains.
SEE OR SEARCH CLASS
178, Telegraphy,
23+, for printing telegraph systems. 250, Radiant Energy,
200+, and the classes specified in the Notes thereto for photo-sensitive electric systems for controlling a device.
307, Electrical Transmission or Interconnection Systems,
112+, for switching arrangements for distribution systems, particularly subclass 140 in which a remote switch is controlled by the exercise of control over the power current supplied to the switch.
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,
108+, for selective telephone-type switches of general utility.
340, Communications: Electrical,
825+, for selective signaling systems in which signals may be selectively controlled; and subclass 825.72 for radio-wave systems for controlling a device.
342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation),
73+, for miscellaneous systems for controlling a device by means of reflected or otherwise returned radio waves (radar).
370, Multiplex Communications, appropriate subclasses for multiplexing systems.
379, Telephonic Communications, 242+, for automatic telephone systems which usually involve selecting means; and subclasses 350+ for call transmitters for telephone systems.
