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发明名称
Elektrisches Mutungsverfahren mit Gleichstrom nach der Sondenmethode
摘要
申请公布号
DE523530(C)
申请公布日期
1931.04.24
申请号
DE1928N029406D
申请日期
1928.10.13
申请人
CHARLES RODNEY NICHOLS;SAMUEL HATHAWAY WILLISTON
发明人
分类号
G01V3/04
主分类号
G01V3/04
代理机构
代理人
主权项
地址
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