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发明名称
Perfectionnements aux écrans de cinéma
摘要
申请公布号
FR715286(A)
申请公布日期
1931.11.28
申请号
FRD715286
申请日期
1931.03.26
申请人
发明人
INC. NATIONAL PAPER PROCESS CO
分类号
G03B21/60
主分类号
G03B21/60
代理机构
代理人
主权项
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