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发明名称
摘要
申请公布号
JPS5616603(Y2)
申请公布日期
1981.04.17
申请号
JP19740030981U
申请日期
1974.03.18
申请人
发明人
分类号
G03B1/60;G03C3/00;(IPC1-7):G03C3/00
主分类号
G03B1/60
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