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发明名称
Improvements in or relating to frequency indicators
摘要
申请公布号
GB882226(A)
申请公布日期
1961.11.15
申请号
GB19570005569
申请日期
1957.02.19
申请人
SPEECH RESEARCH FOR THE DEAF LIMITED
发明人
PLANT GEORGE RHODES GOSLING
分类号
G01R23/00
主分类号
G01R23/00
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