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发明名称
DOWNHOLE LOCK SYSTEM
摘要
申请公布号
GB8327631(D0)
申请公布日期
1983.11.16
申请号
GB19830027631
申请日期
1983.10.14
申请人
OTIS ENG CORPORATION
发明人
分类号
E21B23/02;E21B23/04;E21B34/00;E21B34/10;(IPC1-7):E21B23/04
主分类号
E21B23/02
代理机构
代理人
主权项
地址
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