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发明名称
Telephone system
摘要
申请公布号
US2272464(A)
申请公布日期
1942.02.10
申请号
US19390305146
申请日期
1939.11.18
申请人
SIEMENS BROS. & COMPANY LTD.
发明人
HENSLER BERNARD ANTHONY
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
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