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发明名称
Method and means for measuring light intensities
摘要
申请公布号
US1822061(A)
申请公布日期
1931.09.08
申请号
US19290353036
申请日期
1929.04.06
申请人
RADIO CORPORATION OF AMERICA
发明人
ROBERTS WALTER VAN BRAAM
分类号
H04N5/30
主分类号
H04N5/30
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