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发明名称
IMPROVEMENTS IN OR RELATING TO ROTARY DRILL BITS
摘要
申请公布号
EP0269400(A3)
申请公布日期
1989.08.16
申请号
EP19870310311
申请日期
1987.11.23
申请人
REED TOOL COMPANY LIMITED
发明人
WARDLEY, MICHAEL THOMAS;BURRIDGE, PAUL STEWART
分类号
E21B10/46;E21B10/60;(IPC1-7):E21B10/46
主分类号
E21B10/46
代理机构
代理人
主权项
地址
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