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发明名称
REAMING BIT ASSEMBLY
摘要
申请公布号
US3469641(A)
申请公布日期
1969.09.30
申请号
USD3469641
申请日期
1967.12.11
申请人
COMINCO LTD.
发明人
JOHN WINDLEY REYNOLDS
分类号
E21B10/40;E21B17/04;(IPC1-7):E21B9/22;E21C23/00
主分类号
E21B10/40
代理机构
代理人
主权项
地址
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