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发明名称
摘要
申请公布号
NL7116517(A)
申请公布日期
1972.06.19
申请号
NL19710016517
申请日期
1971.12.01
申请人
发明人
分类号
G03B17/52;G03B19/12;(IPC1-7):G03B19/12;G03B17/17
主分类号
G03B17/52
代理机构
代理人
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