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经营范围
发明名称
Pipe holding slip
摘要
申请公布号
US2580828(A)
申请公布日期
1952.01.01
申请号
US19470740439
申请日期
1947.04.09
申请人
PEARCE WILLIAM L
发明人
PEARCE WILLIAM L.
分类号
E21B19/10
主分类号
E21B19/10
代理机构
代理人
主权项
地址
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