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发明名称
Mikrophonischer Kontaktkoerper mit Hartkohleueberzug
摘要
申请公布号
DE535972(C)
申请公布日期
1931.10.19
申请号
DE1926S073007D
申请日期
1926.01.21
申请人
SIEMENS & HALSKE AKT.-GES.
发明人
HARTMANN CARL A.
分类号
H04R21/00
主分类号
H04R21/00
代理机构
代理人
主权项
地址
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