CA421770A - Telephone system - Google Patents

Telephone system

Info

Publication number
CA421770A
CA421770A CA421770A CA421770DA CA421770A CA 421770 A CA421770 A CA 421770A CA 421770 A CA421770 A CA 421770A CA 421770D A CA421770D A CA 421770DA CA 421770 A CA421770 A CA 421770A
Authority
CA
Canada
Prior art keywords
telephone system
telephone
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
CA421770A
Other languages
French (fr)
Inventor
Kessler Frank
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 Laboratories Inc
Associated Telephone and Telegraph Co
Original Assignee
Automatic Electric Laboratories Inc
Associated Telephone and Telegraph Co
Publication date
Application granted granted Critical
Publication of CA421770A publication Critical patent/CA421770A/en
Expired legal-status Critical Current

Links

CA421770A Telephone system Expired CA421770A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA421770T

Publications (1)

Publication Number Publication Date
CA421770A true CA421770A (en) 1944-08-01

Family

ID=35532752

Family Applications (1)

Application Number Title Priority Date Filing Date
CA421770A Expired CA421770A (en) Telephone system

Country Status (1)

Country Link
CA (1) CA421770A (en)

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