AU5192369A - Circuit arrangement for telephone private branch exchanges with several exchanges which canbe connected together through tie lines
- Google Patents
Circuit arrangement for telephone private branch exchanges with several exchanges which canbe connected together through tie lines
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.)
Expired
Application number
AU51923/69A
Inventor
Ackermann Friedrich
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Filing date
Publication date
Application filedfiledCritical
Publication of AU5192369ApublicationCriticalpatent/AU5192369A/en
AU51923/69A1968-03-281969-03-14Circuit arrangement for telephone private branch exchanges with several exchanges which canbe connected together through tie lines
ExpiredAU5192369A
(en)