Inventor
SUGIURA RYUZO
JP6 patents
Patents
6 patentsUS4759055AJul 19, 1988
Key telephone system
TAMURA ELECTRIC WORKS LTD25 citations90
US4754477AJun 28, 1988
Key telephone system
TAMURA ELECTRIC WORKS LTD7 citations72
US4821316AApr 11, 1989
Key telephone system
TAMURA ELECTRIC WORKS LTD8 citations71
US4823377AApr 18, 1989
System for setting registration mode for key telephone set
TAMURA ELECTRIC WORKS LTD9 citations70
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