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发明名称
Liner hanger
摘要
申请公布号
US2228503(A)
申请公布日期
1941.01.14
申请号
US19390269884
申请日期
1939.04.25
申请人
BOYD
发明人
BOYD FRANK C.;BURNS ERWIN;PILGRIM FORD A.
分类号
E21B43/10
主分类号
E21B43/10
代理机构
代理人
主权项
地址
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