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发明名称
Improvements in or relating to microphones and like devices for converting acoustical vibrations into electric oscillations
摘要
申请公布号
GB497672(A)
申请公布日期
1938.12.23
申请号
GB19370017497
申请日期
1937.06.23
申请人
ALEXANDER ISIDORE ABRAHAMS
发明人
分类号
H04R1/22;H04R9/08
主分类号
H04R1/22
代理机构
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