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AU221000B2 - Improvements in telephone systems - Google Patents

Improvements in telephone systems

Info

Publication number
AU221000B2
AU221000B2 AU27308/57A AU2730857A AU221000B2 AU 221000 B2 AU221000 B2 AU 221000B2 AU 27308/57 A AU27308/57 A AU 27308/57A AU 2730857 A AU2730857 A AU 2730857A AU 221000 B2 AU221000 B2 AU 221000B2
Authority
AU
Australia
Prior art keywords
telephone systems
telephone
systems
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
AU27308/57A
Other versions
AU2730857A (en
Inventor
Davison and Leslie John Allen Alan
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co Ltd
Filing date
Publication date
Application filed by Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Application granted granted Critical
Publication of AU2730857A publication Critical patent/AU2730857A/en
Publication of AU221000B2 publication Critical patent/AU221000B2/en
Expired legal-status Critical Current

Links

AU27308/57A 1957-04-26 Improvements in telephone systems Expired AU221000B2 (en)

Publications (2)

Publication Number Publication Date
AU2730857A AU2730857A (en) 1957-10-31
AU221000B2 true AU221000B2 (en) 1957-10-31

Family

ID=

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