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发明名称
摘要
申请公布号
FR2411455(B1)
申请公布日期
1982.07.23
申请号
FR19770036659
申请日期
1977.12.06
申请人
CLARKE ET SMITH IND LTD
发明人
分类号
G09B21/00;(IPC1-7):G09B21/02;G06K9/00
主分类号
G09B21/00
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