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摘要
申请公布号
US1790127(A)
申请公布日期
1931.01.27
申请号
US19280306966
申请日期
1928.09.19
申请人
WHITCOMB WALTER D
发明人
WHITCOMB WALTER D.
分类号
G09F7/00
主分类号
G09F7/00
代理机构
代理人
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