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发明名称
Drill bits
摘要
申请公布号
GB898004(A)
申请公布日期
1962.06.06
申请号
GB19580018214
申请日期
1958.06.06
申请人
IMPREGNATED DIAMOND PRODUCTS LIMITED
发明人
HOWELLS JOHN
分类号
E21B10/46;E21B10/60
主分类号
E21B10/46
代理机构
代理人
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