Perfectionnements aux outils de perforation de roches,申请号FRD971909-传众专利搜索

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发明名称	Perfectionnements aux outils de perforation de roches
摘要
申请公布号	FR971909(A)	申请公布日期	1951.01.23
申请号	FRD971909	申请日期	1940.10.11
申请人	COMPAGNIE INGERSOLL-RAND	发明人
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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