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Application filed by Northern Electric CofiledCriticalNorthern Electric Co
Priority to BE128636ApriorityCriticalpatent/BE796581A/fr
Publication of BE796581ApublicationCriticalpatent/BE796581A/fr
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
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Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
BE128636A1973-03-091973-03-09Circuit de ligne pour un systeme de telephone a touches
BE796581A
(fr)