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发明名称
Приспособление для увеличения продолжительности контакта в электрических часах
摘要
申请公布号
SU20552(A1)
申请公布日期
1931.04.30
申请号
SU19290050053
申请日期
1929.07.27
申请人
VINOGRADOV A.V.
发明人
VINOGRADOV A.V.
分类号
G04C13/06
主分类号
G04C13/06
代理机构
代理人
主权项
地址
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