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经营范围
发明名称
Improvements in or relating to acoustic devices
摘要
申请公布号
GB467681(A)
申请公布日期
1937.06.22
申请号
GB19360001568
申请日期
1936.01.17
申请人
STANDARD TELEPHONES AND CABLES LIMITED
发明人
分类号
H04R1/42
主分类号
H04R1/42
代理机构
代理人
主权项
地址
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