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.)
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 filedfiledCritical
Priority to JP15112375ApriorityCriticalpatent/JPS5274201A/ja
Publication of JPS5274201ApublicationCriticalpatent/JPS5274201A/ja
Publication of JPS552111B2publicationCriticalpatent/JPS552111B2/ja
H04M9/00—Arrangements for interconnection not involving centralised switching
H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
H04M9/003—Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set, e.g. keyboard or display equipment
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Audible And Visible Signals
(AREA)
Alarm Systems
(AREA)
Time-Division Multiplex Systems
(AREA)
Sub-Exchange Stations And Push- Button Telephones
(AREA)
JP15112375A1975-12-171975-12-17Display control circuit for key telephone system
GrantedJPS5274201A
(en)