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发明名称
摘要
申请公布号
JPS4520850(Y1)
申请公布日期
1970.08.20
申请号
JP19670012955U
申请日期
1967.02.17
申请人
发明人
分类号
(IPC1-7):G03B17/20;G03B13/12
主分类号
(IPC1-7):G03B17/20
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