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经营范围
发明名称
Improvements in or relating to electromagnetic devices, particularly electro-dynamicacoustic devices
摘要
申请公布号
GB380811(A)
申请公布日期
1932.09.19
申请号
GB19310017717
申请日期
1931.06.18
申请人
WESTERN ELECTRIC COMPANY LIMITED;ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
H04R1/22
主分类号
H04R1/22
代理机构
代理人
主权项
地址
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