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发明名称
Visiervorrichtung fuer Heliographen mit zwei Visiereinrichtungen
摘要
申请公布号
DE536336(C)
申请公布日期
1931.10.22
申请号
DED536336D
申请日期
1930.10.30
申请人
EMIL BUSCH AKT.-GES. OPTISCHE INDUSTRIE
发明人
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主分类号
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