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发明名称
Improvements in or relating to acoustic devices
摘要
申请公布号
GB473878(A)
申请公布日期
1937.10.21
申请号
GB19370013106
申请日期
1937.05.07
申请人
STANDARD TELEPHONES AND CABLES LIMITED
发明人
分类号
H04R1/08;H04R1/22
主分类号
H04R1/08
代理机构
代理人
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