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经营范围
发明名称
Sidewall sampler
摘要
申请公布号
US2879972(A)
申请公布日期
1959.03.31
申请号
US19570701698
申请日期
1957.12.06
申请人
DRESSER INDUSTRIES, INC.
发明人
PORTER FORREST VERNON
分类号
E21B49/04
主分类号
E21B49/04
代理机构
代理人
主权项
地址
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