Устройство для коллективного обучения радиотелеграфной связи,申请号SU19310100141-传众专利搜索

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发明名称	Устройство для коллективного обучения радиотелеграфной связи
摘要
申请公布号	SU31471(A1)	申请公布日期	1933.08.31
申请号	SU19310100141	申请日期	1931.12.25
申请人	LAPTEV A.F.	发明人	LAPTEV A.F.
分类号	H04L15/03;G09B13/04	主分类号	H04L15/03
代理机构		代理人
主权项
地址

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