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发明名称
Микрофонно-телефонный усилитель
摘要
申请公布号
SU22738(A1)
申请公布日期
1931.09.30
申请号
SU19290060868
申请日期
1929.12.22
申请人
SHADRIN A.M.
发明人
SHADRIN A.M.
分类号
H03F13/00
主分类号
H03F13/00
代理机构
代理人
主权项
地址
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