Self-advancing mine roof supports and control means therefor,申请号US19650426070-传众专利搜索

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发明名称	Self-advancing mine roof supports and control means therefor
摘要
申请公布号	US3320001(A)	申请公布日期	1967.05.16
申请号	US19650426070	申请日期	1965.01.18
申请人	GULLICK LIMITED	发明人	ALLEN ARCHELAIUS D.;WARD RICHARD
分类号	E21D23/12;E21D23/14	主分类号	E21D23/12
代理机构		代理人
主权项
地址

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