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发明名称
Improvements in telephone systems
摘要
申请公布号
GB454739(A)
申请公布日期
1936.10.07
申请号
GB19350025652
申请日期
1935.09.16
申请人
SIEMENS BROTHERS & CO. LIMITED;WILLIAM HERBERT GRINSTED;HORACE EDGAR HUMPHRIES
发明人
分类号
H04M3/523
主分类号
H04M3/523
代理机构
代理人
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