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发明名称
Combination blackboard and projection screen
摘要
申请公布号
US2528311(A)
申请公布日期
1950.10.31
申请号
US19460658995
申请日期
1946.04.02
申请人
HURLEY ALBERT B
发明人
HURLEY ALBERT B.
分类号
G03B21/58
主分类号
G03B21/58
代理机构
代理人
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地址
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