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发明名称
Core drill
摘要
申请公布号
US1830381(A)
申请公布日期
1931.11.03
申请号
US19300428210
申请日期
1930.02.13
申请人
BARRETT GEORGE J;SOSTHENE ROBICHAUX
发明人
BARRETT GEORGE J.;ROBICHAUX SOSTHENE
分类号
E21B25/02
主分类号
E21B25/02
代理机构
代理人
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