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发明名称
METHOD AND APPARATUS FOR USE IN GRAVEL PACKING WELLS
摘要
申请公布号
US3428128(A)
申请公布日期
1969.02.18
申请号
USD3428128
申请日期
1967.01.12
申请人
LAYNE & BOWLER INC.
发明人
BYFORD A. JONES
分类号
E21B43/04;(IPC1-7):E21B43/04;E21B23/06;E21B33/12
主分类号
E21B43/04
代理机构
代理人
主权项
地址
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