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H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
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FR512108A1914-12-051915-11-23Dispositif pour l'enregistrement et la reproduction phonographiques de conversations transmises par téléphone
ExpiredFR512108A
(fr)
Einrichtung zur phonographischen Aufnahme und WiedEinrichtung zur phonographischen Aufnahme und Wiedergabe telephonisch übermittelter Gespräche. ergabe telephonisch übermittelter Gespräche.
Dispositif pour l'enregistrement photographique des sons et leur reproduction notamment au moyen d'appareils mécaniques à musique et à bruit, des téléphones et des phonographes