Perfectionnements aux forets rotatifs à percussion,申请号FRD975347-传众专利搜索

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发明名称	Perfectionnements aux forets rotatifs à percussion
摘要
申请公布号	FR975347(A)	申请公布日期	1951.03.05
申请号	FRD975347	申请日期	1948.11.22
申请人	THE TIMKEN ROLLER BEARING COMPANY	发明人
分类号	E21B10/40	主分类号	E21B10/40
代理机构		代理人
主权项
地址

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