Percussion drill rod,申请号US19550494133-传众专利搜索

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发明名称	Percussion drill rod
摘要
申请公布号	US2850044(A)	申请公布日期	1958.09.02
申请号	US19550494133	申请日期	1955.03.14
申请人	SANDVIKENS JERNVERKS AKTIEBOLAGET	发明人	KIHLGREN ERIK OSKAR GOSTA
分类号	E21B17/00	主分类号	E21B17/00
代理机构		代理人
主权项
地址

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