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发明名称
摘要
申请公布号
NL7013982(A)
申请公布日期
1971.03.25
申请号
NL19700013982
申请日期
1970.09.22
申请人
发明人
分类号
G03B23/04;G03B23/06;G03B23/10;(IPC1-7):G03B23/10
主分类号
G03B23/04
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代理人
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