TELEPHONE APPARATUS, TELEPHONE RECEIVERS, CALLING APPARATUS, TRANSMISSIONS AND SUPERVISING EQUIPMENTS (TELEPHONY)
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BTTELEPHONY + TELEPHONE ENGINEERING (TELECOMMUNICATIONS)
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UDC621.395.6
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Descriptor GERTELEFONAPPARATE, EMPFANGSAPPARATE, RUFEINRICHTUNGEN, ÜBERTRAGUNGS- UND ÜBERWACHUNGSEINRICHTUNGEN (TELEFONTECHNIK)
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Descriptor ENGTELEPHONE APPARATUS, TELEPHONE RECEIVERS, CALLING APPARATUS, TRANSMISSIONS AND SUPERVISING EQUIPMENTS (TELEPHONY)
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Descriptor FREAPPAREILS TÉLÉPHONIQUES, RÉCEPTEURS, DISPOSITIFS D'APPEL, DISPOSITIFS DE TRANSMISSION ET DE CONTRÔLE (TÉLÉPHONIE)
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NTTELEPHONE APPARATUS + TELEPHONE RECEIVERS + PHONES (TELEPHONY)
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NTCALL COUNTERS + PREPAYMENT APPARATUSES (TELEPHONY)
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NTCALLING EQUIPMENTS (TELEPHONY)
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NTTELEPHONE SWITCHING APPARATUSES (TELEPHONY)
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NTTELEPHONE-SUPERVISION EQUIPMENTS + TELEPHONE-CONTROL EQUIPMENTS (TELEPHONY)
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NTTELEPHONE INTERMEDIATE AMPLIFIERS + TELEPHONE TRANSMISSION APPLIANCES (TELEPHONY)