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摘要
申请公布号
US2316539(A)
申请公布日期
1943.04.13
申请号
US19400337065
申请日期
1940.05.24
申请人
PATTERSON HENRY M
发明人
PATTERSON HENRY M.
分类号
G09F7/18
主分类号
G09F7/18
代理机构
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