Electromagnetic method of underground exploration,申请号US19280249802-传众专利搜索

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发明名称	Electromagnetic method of underground exploration
摘要
申请公布号	US1803405(A)	申请公布日期	1931.05.05
申请号	US19280249802	申请日期	1928.01.27
申请人	J. P. SCRANTON	发明人	RICKER NORMAN H.
分类号	G01V3/06	主分类号	G01V3/06
代理机构		代理人
主权项
地址

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