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发明名称
Free corer
摘要
申请公布号
US3078931(A)
申请公布日期
1963.02.26
申请号
US19600074740
申请日期
1960.12.08
申请人
MOORE DAVID G
发明人
MOORE DAVID G.
分类号
E21B25/18
主分类号
E21B25/18
代理机构
代理人
主权项
地址
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