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发明名称
Verfahren zur Herstellung kugeliger Kohlenkoerner, insbesondere fuer den Gebrauch inMikrophonen
摘要
申请公布号
DE532077(C)
申请公布日期
1931.08.21
申请号
DE1929J037280D
申请日期
1929.03.01
申请人
STANDARD ELEKTRIZITAETS-GESELLSCHAFT AKT.-GES.
发明人
分类号
C01B31/02;H04R21/00
主分类号
C01B31/02
代理机构
代理人
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地址
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