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发明名称
Apparat für Projektion oder Betrachtung von Diapositiven.
摘要
申请公布号
AT157540(B)
申请公布日期
1939.12.11
申请号
ATD157540
申请日期
1938.02.17
申请人
PAUL DUFEK
发明人
PAUL DUFEK
分类号
主分类号
代理机构
代理人
主权项
地址
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