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发明名称
摘要
申请公布号
NL6713924(A)
申请公布日期
1968.04.16
申请号
NL19670013924
申请日期
1967.10.13
申请人
发明人
分类号
G03B27/52;G03G15/00;G03G15/22;G03G15/30;(IPC1-7):G03B/
主分类号
G03B27/52
代理机构
代理人
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