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发明名称
Elektrostatisches Telephon
摘要
申请公布号
DE495547(C)
申请公布日期
1930.04.08
申请号
DE1926N025838D
申请日期
1926.04.29
申请人
F. AUGUST SCHROEDER
发明人
分类号
H04R19/00
主分类号
H04R19/00
代理机构
代理人
主权项
地址
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