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发明名称
Drill rod
摘要
申请公布号
US2419738(A)
申请公布日期
1947.04.29
申请号
US19440541746
申请日期
1944.06.23
申请人
SMITH LOUIE F
发明人
SMITH LOUIE F.
分类号
E21B25/00
主分类号
E21B25/00
代理机构
代理人
主权项
地址
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