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发明名称
Ball dropping assembly
摘要
申请公布号
GB2392690(A)
申请公布日期
2004.03.10
申请号
GB20030023769
申请日期
2003.02.18
申请人
* WEATHERFORD/LAMB INC.
发明人
GERALD DEAN * PEDERSEN;DAVID E * HIRTH
分类号
E21B33/05;E21B33/068;E21B33/16;E21B34/14;(IPC1-7):E21B33/05
主分类号
E21B33/05
代理机构
代理人
主权项
地址
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