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发明名称
Procédé et dispositif de réalisation des surfaces de fresnel
摘要
申请公布号
FR967767(A)
申请公布日期
1950.11.10
申请号
FRD967767
申请日期
1948.06.16
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
B23B5/38;B23Q27/00;B44B3/00;G02B3/08
主分类号
B23B5/38
代理机构
代理人
主权项
地址
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