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经营范围
发明名称
Drilling apparatus
摘要
申请公布号
US2849212(A)
申请公布日期
1958.08.26
申请号
US19560627192
申请日期
1956.12.10
申请人
DAVIS ROBBINS
发明人
ROBBINS DAVIS
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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