Tone signaling system

Details Tone signaling system Tone signaling system

H - Electricity

04

Q

340/166, 379/20

H04Q 7/10 (2006.01) G08C 19/14 (2006.01) H04L 27/30 (2006.01) H04Q 1/45 (2006.01)

Patent

CA 928818

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