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发明名称
Improvements in or relating to apparatus for use in telephone systems
摘要
申请公布号
GB326826(A)
申请公布日期
1930.03.19
申请号
GB19280033943
申请日期
1928.11.19
申请人
ASSOCIATED TELEPHONE & TELEGRAPH COMPANY
发明人
分类号
H04M1/52
主分类号
H04M1/52
代理机构
代理人
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