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发明名称
摘要
申请公布号
JPS4736247(U)
申请公布日期
1972.12.22
申请号
JP19710038360U
申请日期
1971.05.13
申请人
发明人
分类号
G03B23/02;G03C3/00;(IPC1-7):G03C3/00
主分类号
G03B23/02
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