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摘要
申请公布号
US1891933(A)
申请公布日期
1932.12.27
申请号
US19310564757
申请日期
1931.09.24
申请人
WILLIAM HUTT JAMES
发明人
HUTT JAMES WILLIAM
分类号
G09F3/14
主分类号
G09F3/14
代理机构
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