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发明名称
Микротелефон
摘要
申请公布号
SU22739(A1)
申请公布日期
1931.09.30
申请号
SU19290059675
申请日期
1929.12.05
申请人
OSTAKHOV I.I.
发明人
OSTAKHOV I.I.
分类号
H04R13/02
主分类号
H04R13/02
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代理人
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