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Publication of FR780922ApublicationCriticalpatent/FR780922A/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
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FR780922D1934-07-121934-11-07Appareil haut-parleur combinable avec des installations téléphoniques
ExpiredFR780922A
(fr)