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发明名称
Improvements in or relating to electro-magnetic vibratory devices, such, for example, as talking machine pick-ups
摘要
申请公布号
GB341268(A)
申请公布日期
1931.01.15
申请号
GB19300001773
申请日期
1930.01.17
申请人
THE GRAMOPHONE COMPANY LIMITED;BERTRAM JACKSON
发明人
分类号
H04R11/08
主分类号
H04R11/08
代理机构
代理人
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