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发明名称
Improvements in telephone systems
摘要
申请公布号
GB921331(A)
申请公布日期
1963.03.20
申请号
GB19580026108
申请日期
1958.08.14
申请人
AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED
发明人
ALLEN LESLIE JOHN;BENNION ROGER HAROLD
分类号
H04Q3/52
主分类号
H04Q3/52
代理机构
代理人
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地址
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