Signal interrupter circuit for a key telephone system

Details Signal interrupter circuit for a key telephone system Signal interrupter circuit for a key telephone system

H - Electricity

04

Q

379/13, 379/33

H04Q 1/446 (2006.01) H04M 19/02 (2006.01) H04Q 1/30 (2006.01)

Patent

CA 997874

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