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发明名称
Downhole tool
摘要
申请公布号
GB2194573(A)
申请公布日期
1988.03.09
申请号
GB19870020327
申请日期
1987.08.28
申请人
EDGAR EARL * BRYANT
发明人
EDGAR EARL * BRYANT
分类号
E21B31/107;(IPC1-7):E21B31/107
主分类号
E21B31/107
代理机构
代理人
主权项
地址
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