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.)
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Individual
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Individual
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Application filed by IndividualfiledCriticalIndividual
Priority to FR7801638ApriorityCriticalpatent/FR2415395A1/fr
Publication of FR2415395A1publicationCriticalpatent/FR2415395A1/fr
Application grantedgrantedCritical
Publication of FR2415395B1publicationCriticalpatent/FR2415395B1/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)
Telephone Set Structure
(AREA)
FR7801638A1978-01-201978-01-20Poste telephonique simple ou d'intercommunication
GrantedFR2415395A1
(fr)
