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经营范围
发明名称
Electrical signalling systems
摘要
申请公布号
GB562286(A)
申请公布日期
1944.06.26
申请号
GB19430001117
申请日期
1943.01.22
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
分类号
H04Q1/442
主分类号
H04Q1/442
代理机构
代理人
主权项
地址
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