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发明名称
Group education system
摘要
申请公布号
US4786255(A)
申请公布日期
1988.11.22
申请号
US19870072539
申请日期
1987.07.13
申请人
SONY CORPORATION
发明人
HIRAMATSU, TAMIHEI;KITAMI, TAIJI;KANO, TETSUZO;MASUDA, AKIRA;MATSUSHITA, YOSHIKO;SUZUKI, RYUJI;WAKATANI, SHIGEKI;MATSUMOTO, ISAO
分类号
G06Q50/00;G09B5/04;G09B5/08;G09B5/14;G09B7/02;(IPC1-7):G09B5/02
主分类号
G06Q50/00
代理机构
代理人
主权项
地址
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