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发明名称
Sign projection apparatus
摘要
申请公布号
US2238934(A)
申请公布日期
1941.04.22
申请号
US19390259332
申请日期
1939.03.02
申请人
GOLDBERG MAURICE H
发明人
GOLDBERG MAURICE H.
分类号
G03B21/16
主分类号
G03B21/16
代理机构
代理人
主权项
地址
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