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发明名称
ROTARY DRILL BITS
摘要
申请公布号
GB8508622(D0)
申请公布日期
1985.05.09
申请号
GB19850008622
申请日期
1985.04.02
申请人
NL PETROLEUM PRODUCTS LTD
发明人
分类号
B22D15/00;B22D27/20;E21B10/46;E21B10/56;E21B10/567
主分类号
B22D15/00
代理机构
代理人
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