AU112307B2 - Improvements in telephone systems - Google Patents

Improvements in telephone systems

Info

Publication number
AU112307B2
AU112307B2 AU73/40A AU7340A AU112307B2 AU 112307 B2 AU112307 B2 AU 112307B2 AU 73/40 A AU73/40 A AU 73/40A AU 7340 A AU7340 A AU 7340A AU 112307 B2 AU112307 B2 AU 112307B2
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
AU73/40A
Other versions
AU7340A (en
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.)
Associated Telephone and Telegraph Co
Original Assignee
Associated Telephone and Telegraph Co
Filing date
Publication date
Application filed by Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Application granted granted Critical
Publication of AU7340A publication Critical patent/AU7340A/en
Publication of AU112307B2 publication Critical patent/AU112307B2/en
Expired legal-status Critical Current

Links

AU73/40A 1940-01-10 Improvements in telephone systems Expired AU112307B2 (en)

Publications (2)

Publication Number Publication Date
AU7340A AU7340A (en) 1941-01-23
AU112307B2 true AU112307B2 (en) 1941-01-23

Family

ID=

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