Coal boring unit,申请号US19500136716-传众专利搜索

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发明名称	Coal boring unit
摘要
申请公布号	US2669441(A)	申请公布日期	1954.02.16
申请号	US19500136716	申请日期	1950.01.04
申请人	CASTANOLI ALDER F;PARKER DESMOND F	发明人	CASTANOLI ALDER F.;PARKER DESMOND F.
分类号	E21C35/08;E21D9/00	主分类号	E21C35/08
代理机构		代理人
主权项
地址

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