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发明名称
Improvements in telephone systems
摘要
申请公布号
GB374973(A)
申请公布日期
1932.06.23
申请号
GB19310008845
申请日期
1931.03.23
申请人
ALFRED BOHNENBLUST
发明人
分类号
H04M9/08
主分类号
H04M9/08
代理机构
代理人
主权项
地址
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