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发明名称
Whirling display device
摘要
申请公布号
US2561083(A)
申请公布日期
1951.07.17
申请号
US19500150305
申请日期
1950.03.17
申请人
WILLIAM W. WELCH
发明人
JR. WILLIAM W. WELCH,
分类号
G09F19/10
主分类号
G09F19/10
代理机构
代理人
主权项
地址
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