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经营范围
发明名称
Электрический звонок постоянного тока
摘要
申请公布号
SU20489(A1)
申请公布日期
1931.04.30
申请号
SU19290055582
申请日期
1929.09.30
申请人
TUKALOV V.I.
发明人
TUKALOV V.I.
分类号
G10K1/062
主分类号
G10K1/062
代理机构
代理人
主权项
地址
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