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发明名称
Letting-in tool
摘要
申请公布号
US1749827(A)
申请公布日期
1930.03.11
申请号
US19230655017
申请日期
1923.08.01
申请人
OIL WELL SUPPLY COMPANY
发明人
MACK PATRICK H.
分类号
E21B19/07
主分类号
E21B19/07
代理机构
代理人
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地址
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