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发明名称
Lubricator for earth boring drills
摘要
申请公布号
US1909078(A)
申请公布日期
1933.05.16
申请号
US19300468720
申请日期
1930.07.17
申请人
HUGHES TOOL COMPANY
发明人
SCOTT FLOYD L.
分类号
E21B10/24
主分类号
E21B10/24
代理机构
代理人
主权项
地址
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