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发明名称
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摘要
申请公布号
US2053746(A)
申请公布日期
1936.09.08
申请号
US19350040640
申请日期
1935.09.14
申请人
WALTER SHELDON CHARLES
发明人
SHELDON CHARLES WALTER
分类号
G09F3/20
主分类号
G09F3/20
代理机构
代理人
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