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发明名称
Signaling system
摘要
申请公布号
US1829837(A)
申请公布日期
1931.11.03
申请号
US19280259364
申请日期
1928.03.05
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
NEWBY NEAL D.
分类号
H04Q1/32
主分类号
H04Q1/32
代理机构
代理人
主权项
地址
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