US PATENT SUBCLASS 178 / 70 R
REPEATERS

Current as of: June, 1999
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178 /   HD   TELEGRAPHY

70 RREPEATERS {16}
71.1  DF  .~> Automatic in either direction {14}
70 A  DF  .~> Relays only
70 B  DF  .~> Vibrating relays
70 C  DF  .~> Rotary distributors
70 D  DF  .~> Mechanical
70 E  DF  .~> Tuning forks
70 F  DF  .~> Vacuum tubes {1}
70 H  DF  .~> Gas tubes {1}
70 M  DF  .~> Magnetic
70 N  DF  .~> Magnetron repeaters
70 P  DF  .~> Photocell
70 Q  DF  .~> Piezoelectric
70 J  DF  .~> Generator
70 S  DF  .~> Having a carrier wave input
70 T  DF  .~> Oscillatory
70 TS  DF  .~> Using transistors

Unofficial Alpha Subclasses: R A B C D E F G H K M N P Q J S T TS

DEFINITION

Classification: 178/70

(under the class definition) Means whereby the relay, sounder, or recorder on the opening and closing of another circuit with which it is suitably connected is caused to repeat the signals received into another line or circuit. Repeaters of this subclass establish direct communication between distant stations or connect branch and main lines and operate in but one direction at a time and require the services of an attendant for changing the direction of the operation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

56, for repeaters adapted to quadruplex telegraphy.

SEE OR SEARCH CLASS

330, Amplifiers, appropriate subclasses for amplifiers of various types, particularly

61, for those operating on the principle of the microphone.

335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, appropriate subclasses for electromagnetically operated circuit controllers generally, and

220+, for electromagnets with armatures.

340, Communications: Electrical,

291, for signal box system repeaters, such as those which repeat signals arriving at a central to a plurality of fire houses.

361, Electricity: Electrical Systems and Devices,

236+, for speed controlled systems, subclasses 139+ for electromagnetic device control circuits, and subclass 211 for nonelectromagnetic relay control circuits.

375, Pulse or Digital Communications,

211+, for pulse repeaters.

379, Telephonic Communications

338+, for two way repeaters, specific to telephone work and usually operating on the principle of the microphone by varying the renewal current by variable contact pressure.

455, Telecommunications,

7+, for analog modulated carrier wave repeaters.