Air feed for rock drills,申请号US19330674395-传众专利搜索

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发明名称	Air feed for rock drills
摘要
申请公布号	US1992416(A)	申请公布日期	1935.02.26
申请号	US19330674395	申请日期	1933.06.05
申请人	THE CLEVELAND ROCK DRILL COMPANY	发明人	CURTIS JOHN C.
分类号	E21B19/087	主分类号	E21B19/087
代理机构		代理人
主权项
地址

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