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发明名称
Method of forming small apertures in thin metal plates by means of a mandrel, articles manufactured by this method and a device for carrying out this method
摘要
申请公布号
GB732708(A)
申请公布日期
1955.06.29
申请号
GB19530007761
申请日期
1953.03.20
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
B21D31/02
主分类号
B21D31/02
代理机构
代理人
主权项
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