Method and apparatus for sinking mine shafts,申请号US19520293306-传众专利搜索

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发明名称	Method and apparatus for sinking mine shafts
摘要
申请公布号	US2667750(A)	申请公布日期	1954.02.02
申请号	US19520293306	申请日期	1952.06.13
申请人	BAIN CHARLES K	发明人	BAIN CHARLES K.
分类号	E21D5/12	主分类号	E21D5/12
代理机构		代理人
主权项
地址

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