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发明名称
Rotary
摘要
申请公布号
US2115279(A)
申请公布日期
1938.04.26
申请号
US19310571362
申请日期
1931.10.27
申请人
HARRY PENNINGTON
发明人
PENNINGTON HARRY
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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