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
Standard Electrica 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
Priority claimed from FR875899Aexternal-prioritypatent/FR80492E/fr
Application filed by Alcatel Espana SA, Standard Electrica SAfiledCriticalAlcatel Espana SA
Publication of ES281245A1publicationCriticalpatent/ES281245A1/es
Circuit arrangement for testing switching circuits and/or lines with regard to their engaged condition, in tele-communication systems, particularly in telephone exchange systems
Circuit arrangement forthe selective connection oftwo independent electrical apparatus through a common line toa central device, particularly in telephone systems