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发明名称
摘要
申请公布号
CS155657(B1)
申请公布日期
1974.05.30
申请号
CS19700005589
申请日期
1970.08.12
申请人
发明人
分类号
G09B17/00;(IPC1-7):G09B17/00
主分类号
G09B17/00
代理机构
代理人
主权项
地址
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