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发明名称
WELDED DRILL BLADE STABILIZER
摘要
申请公布号
US3447839(A)
申请公布日期
1969.06.03
申请号
USD3447839
申请日期
1967.01.09
申请人
ALBERT H. SALVATORI
发明人
ALBERT H. SALVATORI
分类号
E21B17/10;(IPC1-7):F16C17/02;F16C31/02
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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