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发明名称
INTEGRAL LIGHTWEIGHT DRILL PIPE AND METHOD
摘要
申请公布号
CA673159(A)
申请公布日期
1963.10.29
申请号
CAD673159
申请日期
申请人
PITTSBURGH STEEL COMPANY
发明人
JOSEPH E. SIMONIN
分类号
主分类号
代理机构
代理人
主权项
地址
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