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发明名称
Well-drill jar
摘要
申请公布号
US1775673(A)
申请公布日期
1930.09.16
申请号
US19280284710
申请日期
1928.06.12
申请人
FIELDS FRED A
发明人
FIELDS FRED A.
分类号
E21B31/107
主分类号
E21B31/107
代理机构
代理人
主权项
地址
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