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发明名称
Improvements in apparatus for regulating the volume of sound produced in gramophones and similar apparatus employing electric amplifiers
摘要
申请公布号
GB365392(A)
申请公布日期
1932.01.21
申请号
GB19310007390
申请日期
1931.03.10
申请人
JOSEPH BETHENOD
发明人
分类号
H03G3/06
主分类号
H03G3/06
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