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发明名称
Retriever tool
摘要
申请公布号
US2275911(A)
申请公布日期
1942.03.10
申请号
US19410378842
申请日期
1941.02.14
申请人
LE BUS FRANKLIN L
发明人
BUS FRANKLIN L. LE
分类号
E21B31/18
主分类号
E21B31/18
代理机构
代理人
主权项
地址
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