(under subclass 89) Subject matter wherein the timing means operates by electrical or electromechanical means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
89+, especially 97+ and 101+ for mechanically-operated time interval-timing means.
SEE OR SEARCH CLASS
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,
1+, for miscellaneous phase or time discriminating circuits, subclasses 141+ for miscellaneous synchronizing circuits, subclasses 231+ for miscellaneous phase shift circuits, subclasses 263+ for miscellaneous delay circuits, and subclasses 291+ for miscellaneous pulse or clock waveform generation.
342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation), 61+, and 73+ for systems in which the time interval between transmission and reception of a returned radio wave is determined. Those systems determine, for example, the distance or range of an object from the transmission-reception station.
377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, for pulse counters and pulse counting systems especially
20, for pulse counters used for measuring time combined with measurement of another parameter.
