Key telephone systems using pushbutton or rotary dials

Details Key telephone systems using pushbutton or rotary dials Key telephone systems using pushbutton or rotary dials

H - Electricity

04

Q

344/32

H04Q 1/30 (2006.01) H04M 1/50 (2006.01) H04M 9/00 (2006.01)

Patent

CA 920258

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