Mine supporting structure for working mines,申请号US19500196758-传众专利搜索

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发明名称	Mine supporting structure for working mines
摘要
申请公布号	US2749712(A)	申请公布日期	1956.06.12
申请号	US19500196758	申请日期	1950.11.21
申请人	KARL GERLACH	发明人	GERLACH KARL
分类号	E21D17/086	主分类号	E21D17/086
代理机构		代理人
主权项
地址

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