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发明名称
Vorrichtung zum Umkehren von Negativen auf elektrischem Wege zwecks Pruefung ihrer Kopierfaehigkeit
摘要
申请公布号
DE672888(C)
申请公布日期
1939.03.11
申请号
DE1937I059750D
申请日期
1937.11.30
申请人
I.G. FARBENINDUSTRIE AKT.-GES.
发明人
BIEDERMANN DR. FRIEDRICH
分类号
G03B27/52
主分类号
G03B27/52
代理机构
代理人
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地址
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