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发明名称
Projektionsschirm mit mindestens einer Schar von konzentrischen, lichtablenkenden Oberflächenelementen.
摘要
申请公布号
CH306686(A)
申请公布日期
1955.04.30
申请号
CHD306686
申请日期
1950.04.21
申请人
BEARD,ERNEST GORDON
发明人
GORDON BEARD,ERNEST
分类号
G03B21/60
主分类号
G03B21/60
代理机构
代理人
主权项
地址
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