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发明名称
Sirkulasjonsventil
摘要
申请公布号
NO971741(A)
申请公布日期
1997.10.20
申请号
NO19970001741
申请日期
1997.04.16
申请人
HALLIBURTON ENERGY SERVICES INC
发明人
RINGGENBERG, PAUL D.;SKINNER, NEAL G.
分类号
E21B23/00;E21B34/10;(IPC1-7):E21B34/08
主分类号
E21B23/00
代理机构
代理人
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