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发明名称
Drill bit arrangement
摘要
申请公布号
GB2243387(B)
申请公布日期
1994.07.20
申请号
GB19910008622
申请日期
1991.04.23
申请人
* D.T.A. PTY LTD;* S.D.S.DIGGER TOOLS PTY LTD
发明人
JOHN * ELSBY;ANDREW * GREATHEAD;BRIAN THOMAS * SANFEAD
分类号
E21B4/14;E21B21/12;(IPC1-7):E21B4/14
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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