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发明名称
Work-gripping means for well drilling apparatus
摘要
申请公布号
US1883073(A)
申请公布日期
1932.10.18
申请号
US19280244423
申请日期
1928.01.04
申请人
DOHENY-STONE DRILL CO.
发明人
STONE FREDERICK
分类号
E21B19/10
主分类号
E21B19/10
代理机构
代理人
主权项
地址
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