Foret hélicoïdal pour le percement des roches,申请号FRD1053400-传众专利搜索

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发明名称	Foret hélicoïdal pour le percement des roches
摘要
申请公布号	FR1053400(A)	申请公布日期	1954.02.02
申请号	FRD1053400	申请日期	1952.04.04
申请人		发明人	TSCHAN ALBERT
分类号	E21B10/44	主分类号	E21B10/44
代理机构		代理人
主权项
地址

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