5K002
|
Optical transmission systems
|
5K004
|
Digital transmission methods that use modulated carrier waves
|
5K011
|
TRANSCEIVERS
|
5K012
|
NEAR-FIELD TRANSMISSION SYSTEMS
|
5K014
|
DETECTION AND PREVENTION OF ERRORS IN TRANSMISSION
|
5K015
|
Special services by an exchange (I)
|
5K016
|
Structure of receivers
|
5K017
|
Broadcast distribution systems
|
5K018
|
Bidirectional digital transmission
|
5K019
|
MONITORING AND TESTING OF EXCHANGES
|
5K020
|
Superheterodyne receivers
|
5K021
|
Improvement of the reliability of transmission methods
|
5K022
|
MULTIPLEX COMMUNICATION SYSTEMS OTHER THAN TIME-DIVISION SYSTEMS
|
5K023
|
TELEPHONE SET STRUCTURE
|
5K024
|
Special services for exchanges 2
|
5K025
|
Meter arrangements
|
5K026
|
Exchange systems with centralized control
|
5K027
|
TELEPHONE CIRCUITS
|
5K028
|
Time-division multiplex systems
|
5K029
|
DC digital transmission
|
5K030
|
Data exchanges in wide-area networks
|
5K031
|
Loop systems in small-scale networks
|
5K032
|
Bus systems in small-scale networks
|
5K033
|
SMALL-SCALE NETWORKS (3): OTHER THAN LOOPS OR BUSES
|
5K034
|
COMMUNICATION CONTROL
|
5K035
|
Maintenance and management of digital transmission
|
5K036
|
Display and transmission of telephone numbers
|
5K037
|
DEVICES FOR SUPPLY OF SIGNAL CURRENT
|
5K038
|
INTERCONNECTED COMMUNICATION SYSTEMS, INTERCOMS, AND INTERPHONES
|
5K039
|
Automatic arrangements for answering calls
|
5K040
|
Prepayment telephone systems (i.e., public telephones)
|
5K041
|
Transmission systems not characterized by the medium used for transmission
|
5K042
|
Monitoring and testing of transmission in general
|
5K043
|
Telegraph systems
|
5K044
|
Party-line telephone systems
|
5K045
|
Manual exchange control systems
|
5K046
|
CABLE TRANSMISSION SYSTEMS, EQUALIZATION OF RADIO AND REDUCTION OF ECHO
|
5K047
|
SYNCHRONISATION IN DIGITAL TRANSMISSION SYSTEMS
|
5K048
|
Selective calling equipment (for remote control and measurement)
|
5K049
|
Sub-exchange stations and push- button telephones
|
5K050
|
Interface circuits in exchanges
|
5K051
|
Telephone exchanges
|
5K052
|
Noise elimination
|
5K053
|
Multi-button type push-button tuners
|
5K054
|
Details of transmission, special-medium transmission system
|
5K055
|
Selection arrangement in general, power supply
|
5K056
|
Party-line exchange control systems
|
5K057
|
Adjustment, driving and indication of resonant circuits in general
|
5K058
|
Continuous tuning
|
5K059
|
Diversity systems for radio transmission
|
5K060
|
Transmitters
|
5K061
|
Circuits of receivers in general
|
5K062
|
Input circuits of receivers and coupling of receivers and audio equipment
|
5K063
|
Operator exchange control systems
|
5K064
|
Transmission and reception of signals in exchanges
|
5K065
|
Call-channel selection, storing of information on calling or called subscribers, and translation from the called-subscriber number to outgoing control information
|
5K066
|
Reduction or emphasis of bandwidth of signals
|
5K067
|
MOBILE RADIO COMMUNICATION SYSTEMS
|
5K068
|
Stereo-broadcasting methods
|
5K069
|
Use of switch circuits for exchanges and methods of control of multiplex exchanges
|
5K072
|
RADIO RELAY SYSTEMS
|
5K073
|
STRUCTURE OF TELEPHONE EXCHANGES
|
5K084
|
|
5K089
|
|
5K101
|
Telephonic communication linked with other devices
|
5K102
|
Optical communication system
|
5K127
|
TELEPHONE FUNCTION
|
5K159
|
RADIO TRANSMISSION SYSTEM IN GENERAL (DIVERSITY SYSTEM, ETC.)
|
5K201
|
TELEPHONIC COMMUNICATION SERVICES
|