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发明名称
Retriever for auger earth boring tools
摘要
申请公布号
US3017216(A)
申请公布日期
1962.01.16
申请号
US19600014871
申请日期
1960.03.14
申请人
KOEHRING COMPANY
发明人
HENRY RICHARD E.;WASH FRANK
分类号
E21B31/18
主分类号
E21B31/18
代理机构
代理人
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地址
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