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发明名称
Vorrichtung fuer die Verschlaemmung des Gesteinsstaubes bei Gesteinsbohrarbeiten
摘要
申请公布号
DE681692(C)
申请公布日期
1939.09.28
申请号
DE1937P074985D
申请日期
1937.03.31
申请人
JOHANN PALENT
发明人
PALENT JOHANN
分类号
E21B21/015
主分类号
E21B21/015
代理机构
代理人
主权项
地址
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