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发明名称
Well packer
摘要
申请公布号
US3038541(A)
申请公布日期
1962.06.12
申请号
US19600002184
申请日期
1960.01.13
申请人
FRANK D. SPRAGUE, JR.;GARY D. SPRAGUE
发明人
SPRAGUE FRANK D.
分类号
E21B33/127;E21B33/134;E21B33/14
主分类号
E21B33/127
代理机构
代理人
主权项
地址
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