US PATENT SUBCLASS 178 / 2 D
.~ Round robins
Current as of: June, 1999
Click HD for Main Headings
Click for All Classes
Unofficial Alpha Subclasses: R A B C D E F
DEFINITION
Classification: 178/2
(under the class definition) Miscellaneous means for transmitting messages between stations teles:graphically not otherwise provided for that include a plurality of telegraph instruments, such as transmitting and receiving instruments, in circuit.
(1) Note. Telegraphing and telephoning by Hertzian Waves guided by transmission lines between stations and all line or conductive transmission systems therefor are classified, respectively, in appropriate subclasses under Class 178, Telegraphy and 379, Telephonic Communications.
(2) Note. For telemetric systems specific to measuring, see Class 73, Measuring and Testing; Class 33, Geometrical Instuments, subclasses 267, 312, 317, 363, and 366.11.
SEE OR SEARCH THIS CLASS, SUBCLASS:
43, for telegraphing by induction on neighboring lines, etc.
47, for harmonic or vibratory transmission systems and essential accessories.
64, for applications of induction-coils and transformers to telegraphy. 66.1, for alternating current transmission.
74, for subcombinations comprising a plurality of connected instruments or local circuits at one station employed in transmitting or receiving, such as combinations of key and battery, induction-coils, and the like.
SEE OR SEARCH CLASS
33, Geometrical Instruments, (see (2) Note).
73, Measuring and Testing, (see (2) Note).
246, Railway Switches and Signals,
3+, for central signal control, and subclass 7, and appropriate indented subclasses for train telegraphy or telephony.
310, Electrical Generator or Motor Structure,
10+, for dynamoelectric machine structure for generating electrical current.
333, Wave Transmission Lines and Networks. See the reference to this class under "SEARCH CLASS", in the class definition
above.
336, Inductor Devices, appropriate subclass for the structure of transformers and inductor devices. 338, Electrical Resistors, appropriate subclasses, for electrical resistors, per se.
340, Communications: Electrical,
825+, for selective nontelegraph systems, analogous to the selective systems utilized in telegraphy but restricted to the communication of a limited amount of information or control, subclasses 870.01+ for telemetering systems, and subclasses 287+ for signal box telegraph systems.
341, Coded Data Generation or Conversion,
20+, and 173+ for a pulse code transmitter.
346, Recorders, appropriate subclass.
370, Multiplex Communications, appropriate subclasses for multiplexing systems.
375, Pulse or Digital Communications,
218, for pulse communications using an earth or water transmission medium.
377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, for electrical pulse counters and registers.
429, Chemistry: Electrical Current Producing Apparatus, Product, and Process, for electrochemical batteries useful in telegraphy.
455, Telecommunications, 40, for analog modulated carrier wave communications via an earth or water medium.
