CA452038A - Voice frequency ringing system - Google Patents

Voice frequency ringing system

Info

Publication number
CA452038A
CA452038A CA452038A CA452038DA CA452038A CA 452038 A CA452038 A CA 452038A CA 452038 A CA452038 A CA 452038A CA 452038D A CA452038D A CA 452038DA CA 452038 A CA452038 A CA 452038A
Authority
CA
Canada
Prior art keywords
voice frequency
frequency ringing
ringing system
voice
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
CA452038A
Other languages
French (fr)
Inventor
Gibson Stanley William
Augustus Leibe 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.)
Federal Telephone and Radio Corp
Original Assignee
Federal Telephone and Radio Corp
Publication date
Application granted granted Critical
Publication of CA452038A publication Critical patent/CA452038A/en
Expired legal-status Critical Current

Links

CA452038A Voice frequency ringing system Expired CA452038A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA452038T

Publications (1)

Publication Number Publication Date
CA452038A true CA452038A (en) 1948-10-19

Family

ID=35569766

Family Applications (1)

Application Number Title Priority Date Filing Date
CA452038A Expired CA452038A (en) Voice frequency ringing system

Country Status (1)

Country Link
CA (1) CA452038A (en)

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