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经营范围
发明名称
Signaling system
摘要
申请公布号
US2110932(A)
申请公布日期
1938.03.15
申请号
US19350019294
申请日期
1935.05.01
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
EDWARDS WILLIAM HOPPLE
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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