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发明名称
Privacy signaling system
摘要
申请公布号
US1784891(A)
申请公布日期
1930.12.16
申请号
US19290404138
申请日期
1929.11.01
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
DEAN SAMUEL W.;ANDERSON CLIFFORD N.
分类号
H04K1/04
主分类号
H04K1/04
代理机构
代理人
主权项
地址
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