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发明名称
Improvements in and relating to pick-ups of the variable resistance type
摘要
申请公布号
GB642614(A)
申请公布日期
1950.09.06
申请号
GB19470002854D
申请日期
1948.01.30
申请人
THE BRITISH THOMSON-HOUSTON COMPANY LIMITED
发明人
分类号
H04R21/04
主分类号
H04R21/04
代理机构
代理人
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地址
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