Perfectionnements apportés aux dispositifs d'étayage, notamment à ceux utilisés dans les mines pour l'étayage du toit des galeries,申请号FRD704774-传众专利搜索

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发明名称	Perfectionnements apportés aux dispositifs d'étayage, notamment à ceux utilisés dans les mines pour l'étayage du toit des galeries
摘要
申请公布号	FR704774(A)	申请公布日期	1931.05.26
申请号	FRD704774	申请日期	1930.10.30
申请人		发明人	COCKSON FRANK
分类号	E21D15/60	主分类号	E21D15/60
代理机构		代理人
主权项
地址

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