CA89517A - Ringing key for telephone switchboards - Google Patents

Ringing key for telephone switchboards

Info

Publication number
CA89517A
CA89517A CA000089517A CA89517DA CA89517A CA 89517 A CA89517 A CA 89517A CA 000089517 A CA000089517 A CA 000089517A CA 89517D A CA89517D A CA 89517DA CA 89517 A CA89517 A CA 89517A
Authority
CA
Canada
Prior art keywords
ringing key
telephone switchboards
switchboards
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
CA000089517A
Other languages
French (fr)
Inventor
Charles Ezra Scribner
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.)
Bell Telephone Company of Canada
Original Assignee
Bell Telephone Company of Canada
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bell Telephone Company of Canada filed Critical Bell Telephone Company of Canada
Application granted granted Critical
Publication of CA89517A publication Critical patent/CA89517A/en
Expired legal-status Critical Current

Links

CA000089517A 1904-05-04 1904-05-04 Ringing key for telephone switchboards Expired CA89517A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA89517T 1904-05-04

Publications (1)

Publication Number Publication Date
CA89517A true CA89517A (en) 1904-10-11

Family

ID=45206052

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000089517A Expired CA89517A (en) 1904-05-04 1904-05-04 Ringing key for telephone switchboards

Country Status (1)

Country Link
CA (1) CA89517A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823867A (en) * 1981-09-11 1989-04-25 Pollard Raymond J Fluid flow apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823867A (en) * 1981-09-11 1989-04-25 Pollard Raymond J Fluid flow apparatus

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