CA446505A - Telephone ringing apparatus - Google Patents

Telephone ringing apparatus

Info

Publication number
CA446505A
CA446505A CA446505A CA446505DA CA446505A CA 446505 A CA446505 A CA 446505A CA 446505 A CA446505 A CA 446505A CA 446505D A CA446505D A CA 446505DA CA 446505 A CA446505 A CA 446505A
Authority
CA
Canada
Prior art keywords
telephone ringing
ringing apparatus
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
CA446505A
Other languages
French (fr)
Inventor
H. Herrick Roswell
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
Original Assignee
Automatic Electric Laboratories Inc
Publication date
Application granted granted Critical
Publication of CA446505A publication Critical patent/CA446505A/en
Expired legal-status Critical Current

Links

CA446505A Telephone ringing apparatus Expired CA446505A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA446505T

Publications (1)

Publication Number Publication Date
CA446505A true CA446505A (en) 1948-02-03

Family

ID=35564180

Family Applications (1)

Application Number Title Priority Date Filing Date
CA446505A Expired CA446505A (en) Telephone ringing apparatus

Country Status (1)

Country Link
CA (1) CA446505A (en)

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