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经营范围
发明名称
Electromagnetic expansion and compression circuit for sound transducers
摘要
申请公布号
US2510879(A)
申请公布日期
1950.06.06
申请号
US19460719020
申请日期
1946.12.28
申请人
VIERI FRECCIA
发明人
FRECCIA VIERI
分类号
H03G7/02;H04R11/08
主分类号
H03G7/02
代理机构
代理人
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