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CONST TELEPHONIQUES SOC NOUV
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CONST TELEPHONIQUES SOC NOUV
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Application filed by CONST TELEPHONIQUES SOC NOUVfiledCriticalCONST TELEPHONIQUES SOC NOUV
Application grantedgrantedCritical
Publication of FR787125ApublicationCriticalpatent/FR787125A/en
H04M3/42—Systems providing special services or facilities to subscribers
H04M3/58—Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party
FR787125D1934-06-081934-06-08
Improvements to telephone devices
ExpiredFR787125A
(en)