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经营范围
发明名称
Umlaufventil für Bohrlöcher.
摘要
申请公布号
DE3850618(T2)
申请公布日期
1994.10.20
申请号
DE19883850618T
申请日期
1988.07.15
申请人
HALLIBURTON CO., DUNCAN, OKLA., US
发明人
RINGGENBERG, PAUL DAVID, DUNCAN OKLAHOMA 73533, US
分类号
E21B23/00;E21B34/10;E21B49/00;(IPC1-7):E21B34/10
主分类号
E21B23/00
代理机构
代理人
主权项
地址
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