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经营范围
发明名称
Schalenfoermige Membran (Feder), insbesondere fuer akustische Zwecke
摘要
申请公布号
DE551756(C)
申请公布日期
1932.06.06
申请号
DE1928G074881D
申请日期
1928.11.21
申请人
DR.-ING. RUDOLF GOLDSCHMIDT
发明人
分类号
H04R7/12
主分类号
H04R7/12
代理机构
代理人
主权项
地址
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