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发明名称
Dispositif de fente étroite protégée pour enregistrements sur film
摘要
申请公布号
FR694868(A)
申请公布日期
1930.12.09
申请号
FRD694868
申请日期
1930.05.02
申请人
发明人
KRAEMER SIMON-GERARD-ISRAEL
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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