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发明名称
Privacy system
摘要
申请公布号
US2107756(A)
申请公布日期
1938.02.08
申请号
US19370142815
申请日期
1937.05.15
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
KENDALL BURTON W.;MITCHELL DOREN
分类号
H04K1/02
主分类号
H04K1/02
代理机构
代理人
主权项
地址
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