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发明名称
BACKHEAD AND DRILL ASSEMBLY WITH BACKHEAD
摘要
申请公布号
EP1943407(A4)
申请公布日期
2012.01.04
申请号
EP20060827334
申请日期
2006.10.31
申请人
ROCKMORE INTERNATIONAL, INC.
发明人
BECCU, RAINER, S.
分类号
E21B4/14;E21B1/38
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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