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经营范围
发明名称
Drilling head
摘要
申请公布号
US3083973(A)
申请公布日期
1963.04.02
申请号
US19600029514
申请日期
1960.05.16
申请人
CAMERON IRON WORKS, INC.
发明人
LUCKY MAURICE C.
分类号
E21B33/08
主分类号
E21B33/08
代理机构
代理人
主权项
地址
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