TELEPHONY + TELEPHONE ENGINEERING (TELECOMMUNICATIONS)
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BTTELECOMMUNICATIONS (ELECTRICAL), TELEGRAPHY, TELEPHONY, RADIOCOMMUNICATIONS, TELEVISION, VIDEO ENGINEERING, TELECONTROL
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UDC621.395
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Descriptor GERTELEFONTECHNIK + FERNSPRECHTECHNIK (NACHRICHTENTECHNIK)
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Descriptor ENGTELEPHONY + TELEPHONE ENGINEERING (TELECOMMUNICATIONS)
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Descriptor FRETÉLÉPHONIE + TECHNIQUE TÉLÉPHONIQUE (TÉLÉCOMMUNICATIONS)
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Variant GERTECHNIK/TELEFONTECHNIK (NACHRICHTENTECHNIK)
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Variant GERFERNSPRECHTECHNIK (NACHRICHTENTECHNIK)
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Variant GERTECHNIK/FERNSPRECHTECHNIK (NACHRICHTENTECHNIK)
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Variant GERTELEPHONTECHNIK (NACHRICHTENTECHNIK)
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Variant ENGTELEPHONE ENGINEERING (TELECOMMUNICATIONS)
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Variant ENGENGINEERING/TELEPHONE ENGINEERING (TELECOMMUNICATIONS)
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Variant FRETECHNIQUE TÉLÉPHONIQUE (TÉLÉCOMMUNICATIONS)
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Variant FRETÉLÉPHONIQUE/TÉLÉPHONIQUE (TÉLÉCOMMUNICATIONS)
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NTDIGITAL TELEPHONY + DIGITAL TELEPHONE ENGINEERING (TELECOMMUNICATIONS)
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NTTELEPHONE APPLICATIONS (TELEPHONY)
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NTLONG-DISTANCE TELEPHONY (TELEPHONY)
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NTMULTIPLE TELEPHONY (TELEPHONY)
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NTPUBLIC TELEPHONE SYSTEMS, AUTOMATIC EXCHANGE, SWITCHING SYSTEMS, SIGNAL TRANSMISSIONS (TELEPHONY)
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NTPRIVATE TELEPHONE STATIONS + PRIVATE TELEPHONE NETWORKS (TELEPHONY)
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NTELECTRIC CIRCUITS + SWITCHING CIRCUITS (TELEPHONY)
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NTTELEPHONE INSTALLATIONS, TELEPHONE STATIONS, EXCHANGERS, NETWORKS (TELEPHONY)
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NTTELEPHONE APPARATUS, TELEPHONE RECEIVERS, CALLING APPARATUS, TRANSMISSIONS AND SUPERVISING EQUIPMENTS (TELEPHONY)
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RTWIRELESS TELEPHONY + MOBILE TELEPHONY (RADIO ENGINEERING)
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RTMOBILE RADIOTELEPHONE (RADIO ENGINEERING)
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RTMOBILE COMMUNICATIONS + CELLULAR COMMUNICATIONS (RADIO COMMUNICATIONS)