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发明名称
LAUTSTAERKEREGELUNG FUER KOPFHOERER.
摘要
申请公布号
DE1823363(U)
申请公布日期
1960.12.15
申请号
DE195900B9116U
申请日期
1959.10.15
申请人
FRED R. BEYER;DIANA BIKEL;CHRISTA BEYER
发明人
FRED R. BEYER;DIANA BIKEL;CHRISTA BEYER
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