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发明名称
Improvements in and relating to acoustic devices of the horn type
摘要
申请公布号
GB404072(A)
申请公布日期
1934.01.11
申请号
GB19320023515
申请日期
1932.08.22
申请人
EVELYN STEWART LANSDOWNE BEALE
发明人
分类号
H04R1/30
主分类号
H04R1/30
代理机构
代理人
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地址
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