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发明名称
Oil well drilling transmission
摘要
申请公布号
US2588408(A)
申请公布日期
1952.03.11
申请号
US19470746664
申请日期
1947.05.08
申请人
O'LEARY CHARLES M
发明人
O'LEARY CHARLES M.
分类号
E21B3/02
主分类号
E21B3/02
代理机构
代理人
主权项
地址
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