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经营范围
发明名称
Improvements in or relating to sound recording systems
摘要
申请公布号
GB382596(A)
申请公布日期
1932.10.27
申请号
GB19320019289
申请日期
1932.07.07
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
H03G7/00
主分类号
H03G7/00
代理机构
代理人
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