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摘要
申请公布号
GB1238572(A)
申请公布日期
1971.07.07
申请号
GBD1238572
申请日期
1969.04.21
申请人
发明人
分类号
G03C1/30;G03C5/26;G03C5/305
主分类号
G03C1/30
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