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发明名称
Способ изготовления угольного микрофонного порошка
摘要
申请公布号
SU20148(A1)
申请公布日期
1931.04.30
申请号
SU19290021944
申请日期
1929.02.11
申请人
KARPOV I.YA.
发明人
KARPOV I.YA.
分类号
H04R31/00;H04R21/02
主分类号
H04R31/00
代理机构
代理人
主权项
地址
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