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发明名称
Earth testing instrument
摘要
申请公布号
US1862339(A)
申请公布日期
1932.06.07
申请号
US19320592528
申请日期
1932.02.12
申请人
HIGHMARK JOSEPH H
发明人
HIGHMARK JOSEPH H.
分类号
E21B7/26;E21B10/02;E21B10/64;E21B25/00
主分类号
E21B7/26
代理机构
代理人
主权项
地址
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