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经营范围
发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB502539(A)
申请公布日期
1939.03.17
申请号
GB19370025311
申请日期
1937.09.17
申请人
AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED;JOHN WILLIAM MCCLEW;OWEN AVIS PEARCE
发明人
分类号
H04M3/60
主分类号
H04M3/60
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代理人
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