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发明名称
Vorrichtung zum Anzeigen der Richtung, in der verschiedene Orte in bezug auf einen festen Standpunkt liegen
摘要
申请公布号
DE530678(C)
申请公布日期
1931.07.31
申请号
DE1928T036014D
申请日期
1928.11.25
申请人
JOHN EDWARD THOMPSON
发明人
分类号
G09B29/10
主分类号
G09B29/10
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代理人
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