Roof supporting systems for mine workings,申请号US19640419647-传众专利搜索

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发明名称	Roof supporting systems for mine workings
摘要
申请公布号	US3362169(A)	申请公布日期	1968.01.09
申请号	US19640419647	申请日期	1964.12.21
申请人	KARL MARIA GROETSCHEL	发明人	GROETSCHEL KARL MARIA
分类号	E21D23/00;E21D23/04	主分类号	E21D23/00
代理机构		代理人
主权项
地址

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