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发明名称
Improvements in electric acoustic devices
摘要
申请公布号
GB401823(A)
申请公布日期
1933.11.23
申请号
GB19320021070
申请日期
1932.07.26
申请人
MOTO METER GAUGE & EQUIPMENT CORPORATION
发明人
分类号
G10K9/12
主分类号
G10K9/12
代理机构
代理人
主权项
地址
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