Inventor
YAMAUCHI YUKIJI
JP4 patents
Patents
4 patentsUS4881271ANov 14, 1989
Portable wireless communication systems
HITACHI LTD157 citations97
US4955050ASep 4, 1990
System configuration of wireless PBX and communication method therefor
HITACHI LTD68 citations93
US5247518ASep 21, 1993
High-speed ring lan system
HITACHI LTD49 citations92
US5103447AApr 7, 1992
High-speed ring LAN system
HITACHI LTD49 citations92