Perfectionnements apportés aux boulons à expansion, pour le soutènement ou l'ancrage, notamment dans les toits de mines,申请号FRD1128024-传众专利搜索

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发明名称	Perfectionnements apportés aux boulons à expansion, pour le soutènement ou l'ancrage, notamment dans les toits de mines
摘要
申请公布号	FR1128024(A)	申请公布日期	1957.01.02
申请号	FRD1128024	申请日期	1955.06.18
申请人		发明人	PIERRARD JEAN
分类号	E21D21/00	主分类号	E21D21/00
代理机构		代理人
主权项
地址

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