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经营范围
发明名称
Free coring device
摘要
申请公布号
US3295616(A)
申请公布日期
1967.01.03
申请号
US19640415551
申请日期
1964.12.02
申请人
CHARLTON JOHN D;ABBOTT EDWARD A
发明人
CHARLTON JOHN D.;ABBOTT EDWARD A.
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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