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摘要
申请公布号
US1901495(A)
申请公布日期
1933.03.14
申请号
US19310575538
申请日期
1931.11.17
申请人
LAWRENCE DAVIS
发明人
DAVIS LAWRENCE
分类号
G09F3/02
主分类号
G09F3/02
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代理人
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