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经营范围
发明名称
ELECTRET MICROPHONE
摘要
申请公布号
US3624312(A)
申请公布日期
1971.11.30
申请号
USD3624312
申请日期
1969.08.04
申请人
TESLA NARODNI PODNIK
发明人
VLASTIMIL KOUKAL;OTOKAR KRAKORA
分类号
H04R19/00;(IPC1-7):H04R19/04;H04R23/00
主分类号
H04R19/00
代理机构
代理人
主权项
地址
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