Shield and feed control for mining machine of the screw auger type,申请号US19560561524-传众专利搜索

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发明名称	Shield and feed control for mining machine of the screw auger type
摘要
申请公布号	US2810566(A)	申请公布日期	1957.10.22
申请号	US19560561524	申请日期	1956.01.26
申请人	UNITED STATES STEEL CORPORATION	发明人	PARSONS ROY A.
分类号	E21C25/58	主分类号	E21C25/58
代理机构		代理人
主权项
地址

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