Inventor
KUMATAKA SHINJI
JP4 patents
Patents
4 patentsUS5454028ASep 26, 1995
Cordless key telephone system having zone switching function
NEC CORP45 citations91
US5283817AFeb 1, 1994
Cordless key telephone system for covering multiple service areas having exclusively assigned control channels
NEC CORP30 citations91
US5365572ANov 15, 1994
Cordless key telephone system with multiple tenant facility
NEC CORP40 citations90
US5239572AAug 24, 1993
Cordless key telephone system capable of quickly answering incoming calls
NEC CORP48 citations89