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发明名称
Mud pulse telemetry tool
摘要
申请公布号
GB2157345(A)
申请公布日期
1985.10.23
申请号
GB19850009293
申请日期
1985.04.11
申请人
* DIES DOWNHOLE DRILLING INC
发明人
FLOYD L * SCOTT
分类号
E21B47/18;(IPC1-7):E21B47/12
主分类号
E21B47/18
代理机构
代理人
主权项
地址
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