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发明名称
Pipe slip
摘要
申请公布号
US1874440(A)
申请公布日期
1932.08.30
申请号
US19300499512
申请日期
1930.12.02
申请人
THE NATIONAL SUPPLY COMPANY
发明人
BUSH JOHN CHARLES
分类号
E21B19/10
主分类号
E21B19/10
代理机构
代理人
主权项
地址
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