Rotation mechanism for rock drills,申请号US19380216659-传众专利搜索

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发明名称	Rotation mechanism for rock drills
摘要
申请公布号	US2221117(A)	申请公布日期	1940.11.12
申请号	US19380216659	申请日期	1938.06.30
申请人	THE CLEVELAND ROCK DRILL COMPANY	发明人	JR. WILLIAM A. SMITH,
分类号	E21B6/06	主分类号	E21B6/06
代理机构		代理人
主权项
地址

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