Telescopic hydraulic mine roof support,申请号US19480058949-传众专利搜索

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发明名称	Telescopic hydraulic mine roof support
摘要
申请公布号	US2621631(A)	申请公布日期	1952.12.16
申请号	US19480058949	申请日期	1948.11.08
申请人	DOWTY EQUIPMENT LIMITED	发明人	DOWTY GEORGE H.
分类号	E21D15/45;E21D15/60;F16D65/28	主分类号	E21D15/45
代理机构		代理人
主权项
地址

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