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DIRECCION GENERAL DE YACIMIENT
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DIRECCION GENERAL DE YACIMIENT
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Application filed by DIRECCION GENERAL DE YACIMIENTfiledCriticalDIRECCION GENERAL DE YACIMIENT
Application grantedgrantedCritical
Publication of FR1068611ApublicationCriticalpatent/FR1068611A/fr
H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
FR1068611D1950-04-201950-04-20Perfectionnements aux appareils téléphoniques
ExpiredFR1068611A
(fr)