Inventor
OKUMURA SENJI
JP4 patents
Patents
4 patentsUS4759055AJul 19, 1988
Key telephone system
TAMURA ELECTRIC WORKS LTD25 citations90
US4821316AApr 11, 1989
Key telephone system
TAMURA ELECTRIC WORKS LTD8 citations71
US4794641ADec 27, 1988
Data transmission system of key telephone system
TAMURA ELECTRIC WORKS LTD1 citations47
US4731820AMar 15, 1988
Data transmission system of key telephone system
TAMURA ELECTRIC WORKS LTD1 citations47