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发明名称
Method of freeing pipe jammed in a well
摘要
申请公布号
US2372575(A)
申请公布日期
1945.03.27
申请号
US19380234223
申请日期
1938.10.10
申请人
HAYWARD JOHN T
发明人
HAYWARD JOHN T.
分类号
E21B31/00
主分类号
E21B31/00
代理机构
代理人
主权项
地址
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