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AU434975B2 - Circuit arrangement for switching on busy signal and busy tone in communications installations, in particular telephone exchange installations - Google Patents
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AU434975B2 - Circuit arrangement for switching on busy signal and busy tone in communications installations, in particular telephone exchange installations - Google Patents

Circuit arrangement for switching on busy signal and busy tone in communications installations, in particular telephone exchange installations

Info

Publication number
AU434975B2
AU434975B2 AU31459/67A AU3145967A AU434975B2 AU 434975 B2 AU434975 B2 AU 434975B2 AU 31459/67 A AU31459/67 A AU 31459/67A AU 3145967 A AU3145967 A AU 3145967A AU 434975 B2 AU434975 B2 AU 434975B2
Authority
AU
Australia
Prior art keywords
installations
busy
switching
circuit arrangement
telephone exchange
Prior art date
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
AU31459/67A
Other versions
AU3145967A (en
Inventor
LESSNER and RUDOLF MORLAND PAUL
Filing date
Publication date
Application filed filed Critical
Application granted granted Critical
Publication of AU3145967A publication Critical patent/AU3145967A/en
Publication of AU434975B2 publication Critical patent/AU434975B2/en
Expired legal-status Critical Current

Links

AU31459/67A 1967-12-20 Circuit arrangement for switching on busy signal and busy tone in communications installations, in particular telephone exchange installations Expired AU434975B2 (en)

Publications (2)

Publication Number Publication Date
AU3145967A AU3145967A (en) 1969-06-26
AU434975B2 true AU434975B2 (en) 1969-06-26

Family

ID=

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