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发明名称
SIRKULASJONSVENTIL OG FREMGANGSMAATE FOR BETJENING AV VENTILEN.
摘要
申请公布号
NO864487(A)
申请公布日期
1987.05.13
申请号
NO19860004487
申请日期
1986.11.11
申请人
HALLIBURTON CO
发明人
RINGGENBERG, PAUL DAVID
分类号
E21B23/00;E21B34/10;E21B49/00;(IPC1-7):E21B/
主分类号
E21B23/00
代理机构
代理人
主权项
地址
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