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发明名称
LEARNING SUPPORTING SYSTEM
摘要
申请公布号
JPH03196178(A)
申请公布日期
1991.08.27
申请号
JP19890339472
申请日期
1989.12.26
申请人
RICOH CO LTD
发明人
YANO TAKANORI
分类号
G09B7/04
主分类号
G09B7/04
代理机构
代理人
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