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发明名称
WELL PACKERS
摘要
申请公布号
US3559733(A)
申请公布日期
1971.02.02
申请号
USD3559733
申请日期
1969.05.01
申请人
DRESSER INDUSTRIES INC.
发明人
MARION D. KILGORE
分类号
E21B33/12;E21B33/129;(IPC1-7):E21B33/12
主分类号
E21B33/12
代理机构
代理人
主权项
地址
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