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发明名称
Fanggeraet fuer Tiefbohrungen
摘要
申请公布号
DE656971(C)
申请公布日期
1938.02.23
申请号
DE1936P072402D
申请日期
1936.01.01
申请人
PREUSSISCHE BERGWERKS- UND HUETTEN-AKT.-GES. BERLIN;ZWEIGNIEDERLASSUNG ERDOEL;BOHRVERWALTUNG
发明人
分类号
E21B17/02;E21B31/20
主分类号
E21B17/02
代理机构
代理人
主权项
地址
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