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经营范围
发明名称
Well bit retrieving device
摘要
申请公布号
US2823945(A)
申请公布日期
1958.02.18
申请号
US19550546603
申请日期
1955.11.14
申请人
WILLIAM TILLSON
发明人
TILLSON WILLIAM
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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