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Publication of FR620843ApublicationCriticalpatent/FR620843A/fr
H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems
H04M17/02—Coin-freed or check-freed systems, e.g. mobile- or card-operated phones, public telephones or booths
H04M17/026—Constructional features
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Computer Security & Cryptography
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FR620843D1926-08-271926-08-27Appareil automatique à pièce de monnaie pour communications téléphoniques et applications diverses de cet appareil
ExpiredFR620843A
(fr)