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.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
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 Alcatel Espana SAfiledCriticalAlcatel Espana SA
Publication of ES300082A1publicationCriticalpatent/ES300082A1/en
Interconnected Communication Systems, Intercoms, And Interphones
(AREA)
Abstract
An intercom system equipped with voice frequency key dialing connected to a link line with a number of indoor devices, each of said devices having means of receiving speech frequency signal and means of transmitting voice frequency signal, said means being for transmitting a speech frequency signal capable of transmitting dialing and internal call signals, hook switch means normally connected to said voice frequency receiving means, means responsive to a certain voice frequency signal received in said receiving means to activate a signal and means responsive to the operation of said switch hook to disconnect said signal receiving means and to selectively connect said voice frequency transmitting means to said indoor devices or said link line with which internal dialing or dialing signals are transmitted. (Machine-translation by Google Translate, not legally binding)
ES0300082A1963-05-291964-05-21Intercommunication system (Machine-translation by Google Translate, not legally binding)
ExpiredES300082A1
(en)
A circuit provision for telecommunication switching installations, especially for telephone installations. (Machine-translation by Google Translate, not legally binding)