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发明名称
Privacy system
摘要
申请公布号
US3225142(A)
申请公布日期
1965.12.21
申请号
US19610159885
申请日期
1961.12.18
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
SCHROEDER MANFRED R.
分类号
H04K1/02;H04L9/00
主分类号
H04K1/02
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代理人
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