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发明名称
IMPROVEMENTS IN OR RELATING TO ROTARY DRILL BITS
摘要
申请公布号
GB2238812(A)
申请公布日期
1991.06.12
申请号
GB19900025458
申请日期
1990.11.22
申请人
* REED TOOL COMPANY LIMITED
发明人
JOHN MARTIN * CLEGG;MALCOLM ROY * TAYLOR;LESLIE ROBERT * HAWKE
分类号
E21B10/42;E21B10/43;E21B10/54;E21B10/55
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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