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发明名称
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摘要
申请公布号
US2505300(A)
申请公布日期
1950.04.25
申请号
US19480001039
申请日期
1948.01.07
申请人
EARL NACE CLEMENT
发明人
NACE CLEMENT EARL
分类号
H04N1/08
主分类号
H04N1/08
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