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摘要
申请公布号
DE2162529(A1)
申请公布日期
1972.06.29
申请号
DE19712162529
申请日期
1971.12.16
申请人
发明人
分类号
G03B27/72;G03B27/73;(IPC1-7):G03D/
主分类号
G03B27/72
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