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发明名称
Drum for advertising clocks
摘要
申请公布号
US1898924(A)
申请公布日期
1933.02.21
申请号
US19320635649
申请日期
1932.09.30
申请人
GEORGE WILLENS
发明人
WILLENS GEORGE
分类号
G09F23/16
主分类号
G09F23/16
代理机构
代理人
主权项
地址
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