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Priority claimed from FR8124542Aexternal-prioritypatent/FR2519217A1/en
Priority claimed from FR8219239Aexternal-prioritypatent/FR2536229A2/en
Application filed by Segre Amar LeonellofiledCriticalSegre Amar Leonello
Application grantedgrantedCritical
Publication of ATE14265T1publicationCriticalpatent/ATE14265T1/en
Subscriber line transmission of messages to telephone station - has system substituted for direct link between two lines using two-input mixer respectively receiving message and service signals