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摘要
申请公布号
US1927578(A)
申请公布日期
1933.09.19
申请号
US19330672086
申请日期
1933.05.22
申请人
THOMPSON FRANKLIN H
发明人
THOMPSON FRANKLIN H.
分类号
G09F1/10
主分类号
G09F1/10
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