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发明名称
Microphone amplifier
摘要
申请公布号
US2212848(A)
申请公布日期
1940.08.27
申请号
US19360090860
申请日期
1936.07.16
申请人
DICTOGRAPH PRODUCTS COMPANY, INC.
发明人
SEARS STERLING G.
分类号
H04R11/00;H04R23/02
主分类号
H04R11/00
代理机构
代理人
主权项
地址
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