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发明名称
Electric bell
摘要
申请公布号
US1937403(A)
申请公布日期
1933.11.28
申请号
US19290363608
申请日期
1929.05.16
申请人
DAVICS GWYN O O
发明人
DAVICS GWYN O. O.
分类号
G10K1/064
主分类号
G10K1/064
代理机构
代理人
主权项
地址
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