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经营范围
发明名称
Procédés de superposition de plusieurs inscriptions acoustiques sur un support magnétique
摘要
申请公布号
FR830073(A)
申请公布日期
1938.07.20
申请号
FRD830073
申请日期
1937.03.18
申请人
发明人
THURM LEON
分类号
G11B5/00
主分类号
G11B5/00
代理机构
代理人
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