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摘要
申请公布号
US2905314(A)
申请公布日期
1959.09.22
申请号
US19570659289
申请日期
1957.05.15
申请人
LILLIAN D. BERTRAM
发明人
BERTRAM LILLIAN D.
分类号
G09F5/00
主分类号
G09F5/00
代理机构
代理人
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