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发明名称
Portable, collapsible projection box
摘要
申请公布号
US2730011(A)
申请公布日期
1956.01.10
申请号
US19530346930
申请日期
1953.04.06
申请人
KLEINHAMPLE ALVIN E;PEERY ELMER J
发明人
KLEINHAMPLE ALVIN E.;PEERY ELMER J.
分类号
G03B21/30
主分类号
G03B21/30
代理机构
代理人
主权项
地址
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