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发明名称
Backhead and drill assembly with backhead
摘要
申请公布号
AU2006311987(A1)
申请公布日期
2007.05.18
申请号
AU20060311987
申请日期
2006.10.31
申请人
ROCKMORE INTERNATIONAL, INC.
发明人
RAINER S. BECCU
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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