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经营范围
发明名称
Preparation of non smooth films for use as sound or talking films
摘要
申请公布号
GB355259(A)
申请公布日期
1931.08.17
申请号
GB19300015146
申请日期
1930.05.16
申请人
ABEL ALBERT PIERRE RICHARD
发明人
分类号
G11B27/06
主分类号
G11B27/06
代理机构
代理人
主权项
地址
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