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发明名称
Microphone
摘要
申请公布号
US2202886(A)
申请公布日期
1940.06.04
申请号
US19370148291
申请日期
1937.06.15
申请人
ISADOR ABRAHAMS ALEXANDER
发明人
ABRAHAMS ALEXANDER ISADOR
分类号
H04R1/22;H04R9/08
主分类号
H04R1/22
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代理人
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