Mining machine having extensible and retractable boring arm,申请号US19580740487-传众专利搜索

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发明名称	Mining machine having extensible and retractable boring arm
摘要
申请公布号	US2937859(A)	申请公布日期	1960.05.24
申请号	US19580740487	申请日期	1958.06.06
申请人	NATIONAL MINE SERVICE COMPANY	发明人	JACKSON ALLTON B.
分类号	E21C27/12	主分类号	E21C27/12
代理机构		代理人
主权项
地址

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