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发明名称
Well packer
摘要
申请公布号
US2246881(A)
申请公布日期
1941.06.24
申请号
US19390291974
申请日期
1939.08.25
申请人
ROBINSON PACKER COMPANY
发明人
FISHER CHARLES W.
分类号
E21B33/128
主分类号
E21B33/128
代理机构
代理人
主权项
地址
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