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发明名称
Privacy signaling system
摘要
申请公布号
US1816953(A)
申请公布日期
1931.08.04
申请号
US19290394898
申请日期
1929.09.24
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
BOWN RALPH
分类号
H04K1/04
主分类号
H04K1/04
代理机构
代理人
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地址
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