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AU297721A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
AU297721A
AU297721A AU2977/21A AU297721A AU297721A AU 297721 A AU297721 A AU 297721A AU 2977/21 A AU2977/21 A AU 2977/21A AU 297721 A AU297721 A AU 297721A AU 297721 A AU297721 A AU 297721A
Authority
AU
Australia
Prior art keywords
relating
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
AU2977/21A
Inventor
Fred Thorwald Madsen and Herbert Frederick Obi-ronell all Engineers LOOI West Vanburen Streed Chicago III. LIS. A Arthur Jay Hay
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 Electric Co
Original Assignee
Automatic Electric Co
Filing date
Publication date
Application filed by Automatic Electric Co filed Critical Automatic Electric Co
Publication of AU297721A publication Critical patent/AU297721A/en
Expired legal-status Critical Current

Links

AU2977/21A 1921-08-06 Improvements in or relating to telephone systems Expired AU297721A (en)

Publications (1)

Publication Number Publication Date
AU297721A true AU297721A (en) 1922-06-20

Family

ID=

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