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发明名称
Signaling system
摘要
申请公布号
US1930631(A)
申请公布日期
1933.10.17
申请号
US19320599802
申请日期
1932.03.18
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
THOMPSON ALBERT C.
分类号
H04Q5/22
主分类号
H04Q5/22
代理机构
代理人
主权项
地址
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