Inventor
KIKUCHI JUNZO
JP4 patents
Patents
4 patentsUS4754477AJun 28, 1988
Key telephone system
TAMURA ELECTRIC WORKS LTD7 citations72
US4572928AFeb 25, 1986
Key telephone system
TAMURA ELECTRIC WORKS LTD14 citations70
US4514597AApr 30, 1985
Control of a key telephone system using a pulse width modulated signal
TAMURA ELECTRIC WORKS LTD7 citations70
US4383137AMay 10, 1983
Key telephone system with multiple processor control
TAMURA ELECTRIC WORKS LTD9 citations63