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发明名称
PIEZOELEKTRISCHES KRISTALLELEMENT FUER MIKROFON UND TELEFON.
摘要
申请公布号
DE1642039(U)
申请公布日期
1952.08.07
申请号
DE195000E1179U
申请日期
1950.11.21
申请人
ELECTROACUSTIC G.M.B.H.
发明人
分类号
主分类号
代理机构
代理人
主权项
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