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发明名称
Method of and apparatus for electrical investigation of rock drill holes
摘要
申请公布号
US1996530(A)
申请公布日期
1935.04.02
申请号
US19340742268
申请日期
1934.08.31
申请人
AKTIEBOLAGET ELEKTRISK MALMLETNING
发明人
SUNDBERG KARL;HEDSTROM ERIK HELMER LARS
分类号
G01V3/24
主分类号
G01V3/24
代理机构
代理人
主权项
地址
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