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发明名称
Improvements in or relating to sound translating devices
摘要
申请公布号
GB479328(A)
申请公布日期
1938.02.03
申请号
GB19370016550
申请日期
1937.06.15
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
H04R1/34
主分类号
H04R1/34
代理机构
代理人
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