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经营范围
发明名称
Diaphragme oscillant pour l'enregistrement des sons sur film
摘要
申请公布号
FR715609(A)
申请公布日期
1931.12.07
申请号
FRD715609
申请日期
1931.04.17
申请人
发明人
PIERCE HENRY-ALEXANDER
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
主权项
地址
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