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发明名称
Improvements in and relating to change-over arrangements for use in connection with electrical apparatus employing amplifiers
摘要
申请公布号
GB375830(A)
申请公布日期
1932.06.23
申请号
GB19300038726
申请日期
1930.12.23
申请人
EDIBELL SOUND FILM APPARATUS LIMITED;WILLIAM MEINWARREN BETTS
发明人
分类号
H03F1/30;H03F3/72
主分类号
H03F1/30
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代理人
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