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发明名称
Hohlgestaengeverbindung mit UEberwurfgewindemuffe fuer Rotary-Tiefbohrungen
摘要
申请公布号
DE812905(C)
申请公布日期
1951.09.06
申请号
DE1949H000120
申请日期
1949.10.18
申请人
HUGHES TOOL COMPANY
发明人
SCOTT FLOYD LOGAN
分类号
E21B17/042;F16L15/04
主分类号
E21B17/042
代理机构
代理人
主权项
地址
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