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发明名称
Well-drilling equipment
摘要
申请公布号
US1785163(A)
申请公布日期
1930.12.16
申请号
US19280253606
申请日期
1928.02.11
申请人
ROY WILKINS
发明人
WILKINS ROY
分类号
E21B19/08
主分类号
E21B19/08
代理机构
代理人
主权项
地址
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