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发明名称
摘要
申请公布号
DE2101215(B2)
申请公布日期
1972.07.06
申请号
DE19712101215
申请日期
1971.01.12
申请人
发明人
分类号
G03D15/00;G03D15/10;(IPC1-7):G03B21/64
主分类号
G03D15/00
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