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经营范围
发明名称
Improvements in or relating to electric signalling systems
摘要
申请公布号
GB533360(A)
申请公布日期
1941.02.12
申请号
GB19390022981
申请日期
1939.08.09
申请人
STANDARD TELEPHONES AND CABLES LIMITED;RICHARD ADNEY MEERS;ERNEST RONALD COCKDAIN
发明人
分类号
H04R3/00;H04R27/00
主分类号
H04R3/00
代理机构
代理人
主权项
地址
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