Improvements in or relating to rotary percussion drills and processes of making the same,申请号GB19480012606-传众专利搜索

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发明名称	Improvements in or relating to rotary percussion drills and processes of making the same
摘要
申请公布号	GB646872(A)	申请公布日期	1950.11.29
申请号	GB19480012606	申请日期	1948.05.07
申请人	THE TIMKEN ROLLER BEARING COMPANY	发明人
分类号	E21B17/04	主分类号	E21B17/04
代理机构		代理人
主权项
地址

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