Rotary percussion drill,申请号US19490105772-传众专利搜索

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发明名称	Rotary percussion drill
摘要
申请公布号	US2667373(A)	申请公布日期	1954.01.26
申请号	US19490105772	申请日期	1949.07.20
申请人	THE TIMKEN ROLLER BEARING COMPANY	发明人	HOLSING ROBERT H.
分类号	E21B10/36	主分类号	E21B10/36
代理机构		代理人
主权项
地址

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