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经营范围
发明名称
DOUBLE WALLED CONCENTRIC DRILL PIPE
摘要
申请公布号
CA857170(A)
申请公布日期
1970.12.01
申请号
CAD857170
申请日期
申请人
BECKER DRILLING (ALBERTA) LTD.
发明人
FLOYD W. BECKER
分类号
主分类号
代理机构
代理人
主权项
地址
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