AT193950B -
Automatically controlled two-way amplifier, preferably for telephone systems with loudspeaker telephones, such as executive telephone systems and the like. like
- Google Patents
Automatically controlled two-way amplifier, preferably for telephone systems with loudspeaker telephones, such as executive telephone systems and the like. like
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Publication number
AT193950B
AT193950BAT193950DAAT193950BAT 193950 BAT193950 BAT 193950BAT 193950D AAT193950D AAT 193950DAAT 193950 BAT193950 BAT 193950B
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Application filed by Svenska Relaefabriken AbfiledCriticalSvenska Relaefabriken Ab
Application grantedgrantedCritical
Publication of AT193950BpublicationCriticalpatent/AT193950B/en
AT193950D1954-02-241955-02-24
Automatically controlled two-way amplifier, preferably for telephone systems with loudspeaker telephones, such as executive telephone systems and the like. like
AT193950B
(en)
Automatically controlled two-way amplifier, preferably for telephone systems with loudspeaker telephones, such as executive telephone systems and the like. like
Automatically controlled two-way amplifier, preferably for telephone systems with loudspeaker telephones, such as executive telephone systems and the like. like
Two-way intercom, paging system or the like with speakers that can be used as a microphone as subscriber stations and a common direction-switchable amplifier