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发明名称
ELECTRONIC INSTRUCTIONAL APPARATUS
摘要
申请公布号
GB2210722(B)
申请公布日期
1992.03.25
申请号
GB19870023594
申请日期
1987.10.08
申请人
* VIDEO TECHNOLOGY ELECTRONICS LTD
发明人
ALBERT WAI-KUEN * LEE;WAI-KWOK * CHEW;DAVID TAT-WAI * CHEUNG
分类号
G09B7/02;G09B7/06;G09B17/00;G09B19/02;(IPC1-7):G09B7/02
主分类号
G09B7/02
代理机构
代理人
主权项
地址
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