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发明名称
MICROPHONE UNITS
摘要
申请公布号
GB1487847(A)
申请公布日期
1977.10.05
申请号
GB19740041782
申请日期
1974.09.25
申请人
ARD ANSTALT
发明人
分类号
H04R1/22;H04R1/38;H04R1/40;(IPC1-7):H04R1/32
主分类号
H04R1/22
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代理人
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