Apparatus for mining coal or other minerals from the solid with deeply penetrating bits,申请号US19480011688-传众专利搜索

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发明名称	Apparatus for mining coal or other minerals from the solid with deeply penetrating bits
摘要
申请公布号	US2798711(A)	申请公布日期	1957.07.09
申请号	US19480011688	申请日期	1948.02.27
申请人	JOY MANUFACTURING COMPANY	发明人	SILVER HAROLD F.
分类号	E21C27/26	主分类号	E21C27/26
代理机构		代理人
主权项
地址

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