Rotation release for rock drills,申请号US19380222094-传众专利搜索

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发明名称	Rotation release for rock drills
摘要
申请公布号	US2179643(A)	申请公布日期	1939.11.14
申请号	US19380222094	申请日期	1938.07.30
申请人	CHICAGO PNEUMATIC TOOL COMPANY	发明人	O'FARRELL MATTHEW
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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