TELEGRAPHY (ORGANISATION, OPERATION)
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BTBROADCASTING, TELEGRAPHY, TELEPHONY, TELEVISION (ORGANISATION, OPERATION)
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UDC654.14
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Descriptor GERTELEGRAPHIE (ORGANISATION, BETRIEB)
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Descriptor ENGTELEGRAPHY (ORGANISATION, OPERATION)
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Descriptor FRETÉLÉGRAPHIE (ORGANISATION, OPÉRATION)
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NTRADIOTELEGRAPHY (ORGANISATION, OPERATION)
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RTTELEGRAPHY (TELECOMMUNICATIONS)