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发明名称
Dispositif pour le contrôle des enregistrements de films sonores
摘要
申请公布号
FR701158(A)
申请公布日期
1931.03.12
申请号
FRD701158
申请日期
1930.08.12
申请人
SIEMENS & HALSKE AKTIEN-GESELLSCHAFT
发明人
分类号
主分类号
代理机构
代理人
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