Inventor

MAGINLEY RONALD J

US3 patents

Patents

3 patents

US5027345AJun 25, 1991

Digital key telephone system

NORTHERN TELECOM LTD27 citations89

US4893310AJan 9, 1990

Digital key telephone system

NORTHERN TELECOM LTD25 citations89

US4873682AOct 10, 1989

Digital key telephone system

NORTHERN TELECOM LTD12 citations67