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Filing date
Publication date
Application filedfiledCritical
Priority to JP9727675ApriorityCriticalpatent/JPS5220709A/ja
Publication of JPS5220709ApublicationCriticalpatent/JPS5220709A/ja
Publication of JPS5416362B2publicationCriticalpatent/JPS5416362B2/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
H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line
H04M9/006—Exchange line circuits
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Sub-Exchange Stations And Push- Button Telephones
(AREA)
JP9727675A1975-08-111975-08-11Line wire circuit of button telephone set
GrantedJPS5220709A
(en)