CA427449A - Telephone ringing system - Google Patents

Telephone ringing system

Info

Publication number
CA427449A
CA427449A CA427449A CA427449DA CA427449A CA 427449 A CA427449 A CA 427449A CA 427449 A CA427449 A CA 427449A CA 427449D A CA427449D A CA 427449DA CA 427449 A CA427449 A CA 427449A
Authority
CA
Canada
Prior art keywords
telephone ringing
ringing system
telephone
ringing
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
CA427449A
Other languages
French (fr)
Inventor
William Halligan Clair
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
Bell Telephone Laboratories Inc
Publication date
Application granted granted Critical
Publication of CA427449A publication Critical patent/CA427449A/en
Expired legal-status Critical Current

Links

CA427449A Telephone ringing system Expired CA427449A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA427449T

Publications (1)

Publication Number Publication Date
CA427449A true CA427449A (en) 1945-05-08

Family

ID=35538479

Family Applications (1)

Application Number Title Priority Date Filing Date
CA427449A Expired CA427449A (en) Telephone ringing system

Country Status (1)

Country Link
CA (1) CA427449A (en)

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