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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB323558(A)
申请公布日期
1930.01.09
申请号
GB19280028994
申请日期
1928.10.09
申请人
AUTOMATIC TELEPHONE MANUFACTURING COMPANY LIMITED;CHARLES GILLINGS;JAMES MCGAVIN
发明人
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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地址
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