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发明名称
Focus system
摘要
申请公布号
US2691119(A)
申请公布日期
1954.10.05
申请号
US19500201913
申请日期
1950.12.21
申请人
ALLEN B. DU MONT LABORATORIES, INC.
发明人
LEON JOHN DE
分类号
H04N3/26
主分类号
H04N3/26
代理机构
代理人
主权项
地址
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