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摘要
申请公布号
US2372994(A)
申请公布日期
1945.04.03
申请号
US19420438052
申请日期
1942.04.07
申请人
WELCH THOMAS R
发明人
WELCH THOMAS R.
分类号
G09F3/02;G09F3/10;H01B7/36
主分类号
G09F3/02
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