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发明名称
Well drilling machine
摘要
申请公布号
US1891416(A)
申请公布日期
1932.12.20
申请号
US19290381328
申请日期
1929.07.26
申请人
HARRIS IRVING C
发明人
HARRIS IRVING C.
分类号
E21B6/00
主分类号
E21B6/00
代理机构
代理人
主权项
地址
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