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发明名称
Kelly bushing
摘要
申请公布号
US2179006(A)
申请公布日期
1939.11.07
申请号
US19380209522
申请日期
1938.05.23
申请人
BAASH-ROSS TOOL COMPANY
发明人
BRONZAN BLASITO;JOHNSON GLENN D.
分类号
E21B3/04
主分类号
E21B3/04
代理机构
代理人
主权项
地址
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