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发明名称
Improvements in sound receiving apparatus
摘要
申请公布号
GB547082(A)
申请公布日期
1942.08.12
申请号
GB19410004824
申请日期
1941.04.11
申请人
GEORGE THOMAS CAIN
发明人
分类号
H04R3/00
主分类号
H04R3/00
代理机构
代理人
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