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发明名称
LAERMSCHUTZ FUER TELEFONHOERER.
摘要
申请公布号
DE1711085(U)
申请公布日期
1955.11.17
申请号
DE195500F9745U
申请日期
1955.07.01
申请人
WILLI FEINER
发明人
WILLI FEINER
分类号
主分类号
代理机构
代理人
主权项
地址
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