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发明名称
DRILLING STRAIGHT HOLES
摘要
申请公布号
AU555716(B2)
申请公布日期
1986.10.09
申请号
AU19820089675
申请日期
1982.10.21
申请人
BEVER CONTROL A/S
发明人
HAKON EINAR BJOR
分类号
E21B7/04;E21B7/06;E21B7/08;E21B47/022;(IPC1-7):E21B44/00;E21C9/00
主分类号
E21B7/04
代理机构
代理人
主权项
地址
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