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经营范围
发明名称
Mineral piercing apparatus
摘要
申请公布号
US3173499(A)
申请公布日期
1965.03.16
申请号
US19610158001
申请日期
1961.12.08
申请人
UNION CARBIDE CANADA LIMITED
发明人
ROSS JOHN W.
分类号
E21B7/14;F23D11/24
主分类号
E21B7/14
代理机构
代理人
主权项
地址
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