Inventor
YOKOZAWA TOORU
JP4 patents
Patents
4 patentsUS5933478AAug 3, 1999
Data transfer system and handheld terminal device used therefor
HITACHI LTD206 citations96
US5740369AApr 14, 1998
Information delivery system and portable information terminal
HITACHI LTD99 citations95
US6850267B2Feb 1, 2005
Video telephone system and terminal device therefor
HITACHI LTD7 citations71
US7584431B2Sep 1, 2009
Communication system and terminal units connected thereto
HITACHI LTD3 citations60