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经营范围
发明名称
DRILL BIT PLUG
摘要
申请公布号
CA547714(A)
申请公布日期
1957.10.22
申请号
CAD547714
申请日期
申请人
JOHN R. FLANAGAN
发明人
JOHN R. FLANAGAN
分类号
E21B12/04
主分类号
E21B12/04
代理机构
代理人
主权项
地址
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