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发明名称
Drill collar
摘要
申请公布号
US2126075(A)
申请公布日期
1938.08.09
申请号
US19360097507
申请日期
1936.08.24
申请人
WRIGHT MARTHA H
发明人
WRIGHT MARTHA H.
分类号
E21B17/16
主分类号
E21B17/16
代理机构
代理人
主权项
地址
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