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发明名称
Signaling system
摘要
申请公布号
US1805591(A)
申请公布日期
1931.05.19
申请号
US19260155726
申请日期
1926.12.18
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
OHL RUSSELL S.
分类号
H04B1/10;H04B7/02
主分类号
H04B1/10
代理机构
代理人
主权项
地址
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