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发明名称
摘要
申请公布号
DE1960963(B2)
申请公布日期
1972.07.27
申请号
DE19691960963
申请日期
1969.12.04
申请人
发明人
分类号
G02C11/06;H04R25/00
主分类号
G02C11/06
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