CA994433A - Multifrequency tone detecting arrangement - Google Patents

Multifrequency tone detecting arrangement

Info

Publication number
CA994433A
CA994433A CA239,887A CA239887A CA994433A CA 994433 A CA994433 A CA 994433A CA 239887 A CA239887 A CA 239887A CA 994433 A CA994433 A CA 994433A
Authority
CA
Canada
Prior art keywords
detecting arrangement
tone detecting
multifrequency tone
multifrequency
arrangement
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
CA239,887A
Inventor
John F. O'neill
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
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
Priority claimed from US349948A external-priority patent/US3914557A/en
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to CA239,887A priority Critical patent/CA994433A/en
Application granted granted Critical
Publication of CA994433A publication Critical patent/CA994433A/en
Expired legal-status Critical Current

Links

CA239,887A 1973-04-11 1975-11-18 Multifrequency tone detecting arrangement Expired CA994433A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA239,887A CA994433A (en) 1973-04-11 1975-11-18 Multifrequency tone detecting arrangement

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US349948A US3914557A (en) 1973-04-11 1973-04-11 Multifrequency tone detecting arrangement
CA188,538A CA994484A (en) 1973-04-11 1973-12-19 Multifrequency tone detecting arrangement
CA239,887A CA994433A (en) 1973-04-11 1975-11-18 Multifrequency tone detecting arrangement

Publications (1)

Publication Number Publication Date
CA994433A true CA994433A (en) 1976-08-03

Family

ID=27163218

Family Applications (1)

Application Number Title Priority Date Filing Date
CA239,887A Expired CA994433A (en) 1973-04-11 1975-11-18 Multifrequency tone detecting arrangement

Country Status (1)

Country Link
CA (1) CA994433A (en)

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