Water tube for rock drills,申请号US19370180311-传众专利搜索

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发明名称	Water tube for rock drills
摘要
申请公布号	US2164886(A)	申请公布日期	1939.07.04
申请号	US19370180311	申请日期	1937.12.17
申请人	THE CLEVELAND ROCK DRILL COMPANY	发明人	RENFER JOHN E.
分类号	E21B21/00	主分类号	E21B21/00
代理机构		代理人
主权项
地址

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