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发明名称
Improvements in or relating to electrical signalling systems
摘要
申请公布号
GB325530(A)
申请公布日期
1930.02.18
申请号
GB19280030184
申请日期
1928.10.18
申请人
AUTOMATIC TELEPHONE MANUFACTURING COMPANY LIMITED;GEORGE ARTHUR BURNS
发明人
分类号
G08B25/00
主分类号
G08B25/00
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代理人
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