Oil shale mining machine,申请号US19460654969-传众专利搜索

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发明名称	Oil shale mining machine
摘要
申请公布号	US2495840(A)	申请公布日期	1950.01.31
申请号	US19460654969	申请日期	1946.03.16
申请人	FINDLATER JOHN G	发明人	FINDLATER JOHN G.
分类号	E21C27/24	主分类号	E21C27/24
代理机构		代理人
主权项
地址

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