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发明名称
Taschenartige Huelle zur Ordnung und Aufbewahrung photographischer Negative
摘要
申请公布号
DE518067(C)
申请公布日期
1931.02.12
申请号
DED518067D
申请日期
1930.03.21
申请人
CARL NEUMANN
发明人
分类号
G03B21/64
主分类号
G03B21/64
代理机构
代理人
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