Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Le Materiel Telephonique Thomson CSFfiledCriticalLe Materiel Telephonique Thomson CSF
Application grantedgrantedCritical
Publication of FR757534ApublicationCriticalpatent/FR757534A/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
H04M17/023—Circuit arrangements
Landscapes
Engineering & Computer Science
(AREA)
Computer Networks & Wireless Communication
(AREA)
Computer Security & Cryptography
(AREA)
Signal Processing
(AREA)
Prepayment Telephone Systems
(AREA)
FR757534D1932-09-281932-09-28Perfectionnements aux systèmes téléphoniques automatiques ou semiautomatiques comprenant des postes à prépaiement
ExpiredFR757534A
(fr)
Perfectionnements aux systèmes de centraux téléphoniques automatiques ou semi-automatiques ou analogues et aux appareils à prépayement employés avec ces systèmes