Multifrequency dialing signal receiver for push-button type...

Details Multifrequency dialing signal receiver for push-button type... Multifrequency dialing signal receiver for push-button type...

H - Electricity

04

Q

328/164, 379/21,

H04Q 1/457 (2006.01) H04M 1/50 (2006.01)

Patent

CA 1003982

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