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发明名称
Vorrichtung zur Erzeugung einer Schattenwand vor einem Projektionsschirm
摘要
申请公布号
DE497944(C)
申请公布日期
1930.05.21
申请号
DE1927P056364D
申请日期
1927.11.01
申请人
CESAR PAROLINI
发明人
分类号
G03B21/62;G09F19/18
主分类号
G03B21/62
代理机构
代理人
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地址
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