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经营范围
发明名称
UMLEITUNGSVENTIL FUER PACKER.
摘要
申请公布号
DE3782728(D1)
申请公布日期
1992.12.24
申请号
DE19873782728
申请日期
1987.12.04
申请人
HALLIBURTON CO., DUNCAN, OKLA., US
发明人
CHRISTENSEN, JON BRENT;ZELLER, VINCENT PAUL;BECK, HAROLD KENT, DUNCAN OKLAHOMA 73533, US
分类号
E21B33/124;E21B34/12;(IPC1-7):E21B34/12
主分类号
E21B33/124
代理机构
代理人
主权项
地址
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