Method and apparatus for underground hydraulic mining,申请号US19290378601-传众专利搜索

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发明名称	Method and apparatus for underground hydraulic mining
摘要
申请公布号	US1856836(A)	申请公布日期	1932.05.03
申请号	US19290378601	申请日期	1929.07.16
申请人	SYLVESTER HOWELL	发明人	HOWELL SYLVESTER
分类号	E21C45/00	主分类号	E21C45/00
代理机构		代理人
主权项
地址

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