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发明名称
Picture projection screen
摘要
申请公布号
US2202988(A)
申请公布日期
1940.06.04
申请号
US19390252320
申请日期
1939.01.23
申请人
KENNEDY DEWEY M
发明人
KENNEDY DEWEY M.
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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