Key telephone system using time division and space division...

Details Key telephone system using time division and space division... Key telephone system using time division and space division...

H - Electricity

04

Q

344/18, 379/33

H04Q 3/00 (2006.01) H04M 1/00 (2006.01) H04M 9/00 (2006.01) H04M 9/02 (2006.01)

Patent

CA 1018270

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