Water valve for rock drills,申请号US19380245897-传众专利搜索

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发明名称	Water valve for rock drills
摘要
申请公布号	US2215217(A)	申请公布日期	1940.09.17
申请号	US19380245897	申请日期	1938.12.15
申请人	GARDNER-DENVER COMPANY	发明人	GUSTAFSON HJALMER C.
分类号	E21B21/01	主分类号	E21B21/01
代理机构		代理人
主权项
地址

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