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发明名称
Bohrungsverfahren und Geraete mit phasenverschobenen Druckaenderungen in einer Bohrfluessigkeit
摘要
申请公布号
DE1558977(A1)
申请公布日期
1970.04.23
申请号
DE19671558977
申请日期
1967.07.25
申请人
HUGHES TOOL COMPANY
发明人
分类号
E21B7/24;E21B21/00
主分类号
E21B7/24
代理机构
代理人
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地址
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