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发明名称
Improvements in or relating to semi-automatic telephone systems
摘要
申请公布号
GB387373(A)
申请公布日期
1933.02.06
申请号
GB19310022058
申请日期
1931.08.04
申请人
STANDARD TELEPHONES AND CABLES, LIMITED;JOHN HENRY ELVIDGE BAKER
发明人
分类号
H04M3/60
主分类号
H04M3/60
代理机构
代理人
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