Procédé et dispositif de protection contre les poussières nuisibles à la santé dégagées pendant les travaux de forage de la roche,申请号FRD676577-传众专利搜索

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发明名称	Procédé et dispositif de protection contre les poussières nuisibles à la santé dégagées pendant les travaux de forage de la roche
摘要
申请公布号	FR676577(A)	申请公布日期	1930.02.25
申请号	FRD676577	申请日期	1929.06.12
申请人	MINIMAX A. G.	发明人
分类号	E21B21/14	主分类号	E21B21/14
代理机构		代理人
主权项
地址

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