Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Autophon AgfiledCriticalAutophon Ag
Publication of CH256355ApublicationCriticalpatent/CH256355A/de
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
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04M—TELEPHONIC COMMUNICATION
H04M3/00—Automatic or semi-automatic exchanges
H04M3/42—Systems providing special services or facilities to subscribers
H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Multimedia
(AREA)
Interconnected Communication Systems, Intercoms, And Interphones
(AREA)
CH256355D1942-12-101942-12-10Einrichtung für Konferenzgespräche in Fernsprechanlagen für lautstarken und lautschwachen Verkehr.
CH256355A
(de)