FR662254A - Dispositif destiné à faciliter l'utilisation du réseau téléphonique sur les voies publiques plus particulièrement pour les automobilistes
- Google Patents
Dispositif destiné à faciliter l'utilisation du réseau téléphonique sur les voies publiques plus particulièrement pour les automobilistes
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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
H04M17/023—Circuit arrangements
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Engineering & Computer Science
(AREA)
Computer Networks & Wireless Communication
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Computer Security & Cryptography
(AREA)
Signal Processing
(AREA)
FR662254D1928-02-031928-02-03Dispositif destiné à faciliter l'utilisation du réseau téléphonique sur les voies publiques plus particulièrement pour les automobilistes
ExpiredFR662254A
(fr)