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发明名称
Procédé et dispositif pour la superposition de plusieurs enregistrements acoustiques ou optiques sur une même spirale magnétique par déplacement des fréquences enregistrées vers l'infra ou l'ultra-région du spectre sensible
摘要
申请公布号
FR715420(A)
申请公布日期
1931.12.03
申请号
FRD715420
申请日期
1930.08.21
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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