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发明名称
Vorrichtung zum Absaugen des bei der Herstellung von Bohrloechern entstehenden Staubes
摘要
申请公布号
DE564417(C)
申请公布日期
1932.11.18
申请号
DED564417D
申请日期
1930.12.07
申请人
ANTON TWENTE
发明人
分类号
E21B21/07
主分类号
E21B21/07
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