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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB325549(A)
申请公布日期
1930.02.21
申请号
GB19280034283
申请日期
1928.11.21
申请人
ASSOCIATED TELEPHONE & TELEGRAPH COMPANY
发明人
分类号
H04M17/02
主分类号
H04M17/02
代理机构
代理人
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