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经营范围
发明名称
Signaling system
摘要
申请公布号
US2410814(A)
申请公布日期
1946.11.12
申请号
US19410423130
申请日期
1941.12.16
申请人
AMERICAN DISTRICT TELEGRAPH COMPANY
发明人
EVANS FRANCIS C.
分类号
G08B17/04
主分类号
G08B17/04
代理机构
代理人
主权项
地址
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