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经营范围
发明名称
Resonanzfreie Membran
摘要
申请公布号
DE482040(C)
申请公布日期
1931.04.01
申请号
DENDATR069532D
申请日期
申请人
EUGEN REISZ
发明人
分类号
H04R7/04;H04R7/26
主分类号
H04R7/04
代理机构
代理人
主权项
地址
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