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发明名称
VORRICHTUNG ZUR AUFNAHME ODER WIEDERGABE VON TONAUFZEICHNUNGEN.
摘要
申请公布号
DE1704016(U)
申请公布日期
1955.08.04
申请号
DE195500E7174U
申请日期
1955.05.31
申请人
ELECTROACUSTIC GESELLSCHAFT M.B.H.
发明人
分类号
主分类号
代理机构
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