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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co LtdfiledCriticalNEC Corp
Priority to JP2120577ApriorityCriticalpatent/JPS53105919A/en
Publication of JPS53105919ApublicationCriticalpatent/JPS53105919A/en
H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
Abstract
PURPOSE:To secure a connection of the ring-down signal circuit also through the dial selection jack, by installing a switch between the switchboard and the ringdown signal circuit.
JP2120577A1977-02-281977-02-28Ring-down control system
PendingJPS53105919A
(en)