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发明名称
LERNSYSTEM
摘要
申请公布号
DE2529529(A1)
申请公布日期
1976.01.22
申请号
DE19752529529
申请日期
1975.07.02
申请人
GOLDMARK COMMUNICATIONS CORP.
发明人
C. GOLDMARK,PETER
分类号
G09B15/00;G09B5/04;G11B5/00;(IPC1-7):G09B5/04;G11B23/16
主分类号
G09B15/00
代理机构
代理人
主权项
地址
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