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发明名称
Sound amplifier
摘要
申请公布号
US2229296(A)
申请公布日期
1941.01.21
申请号
US19380240023
申请日期
1938.11.12
申请人
LA MAR CHARLES ROY;KIRBY LELAND R
发明人
MAR CHARLES ROY LA;KIRBY LELAND R.
分类号
H04R23/00
主分类号
H04R23/00
代理机构
代理人
主权项
地址
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