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发明名称
Regulator til Forøgelse eller Formindskelse af elektro-akustiske Signalers Lydstyrke.
摘要
申请公布号
DK56566(C)
申请公布日期
1939.08.21
申请号
DKD56566
申请日期
1937.06.22
申请人
STANDARD ELECTRIC AKTIESELSKAB (STANDARD ELECTRIC LTD.)
发明人
分类号
主分类号
代理机构
代理人
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