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经营范围
发明名称
Soil penetration testing and sampling device for use in deep drill holes
摘要
申请公布号
US2704202(A)
申请公布日期
1955.03.15
申请号
US19510231418
申请日期
1951.06.13
申请人
RHOADES EARLE D
发明人
RHOADES EARLE D.
分类号
E21B49/02
主分类号
E21B49/02
代理机构
代理人
主权项
地址
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