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发明名称
Privacy system
摘要
申请公布号
US2405599(A)
申请公布日期
1946.08.13
申请号
US19410412070
申请日期
1941.09.24
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MITCHELL DOREN
分类号
H04K1/02
主分类号
H04K1/02
代理机构
代理人
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地址
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