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发明名称
摘要
申请公布号
JPS5638490(Y2)
申请公布日期
1981.09.08
申请号
JP19770014077U
申请日期
1977.02.08
申请人
发明人
分类号
G02B23/00;G02B23/18;G02B27/22;(IPC1-7):G02B23/18
主分类号
G02B23/00
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代理人
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