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发明名称
DIGITAL DATA SECRET DEVICE
摘要
申请公布号
JPH04211543(A)
申请公布日期
1992.08.03
申请号
JP19910049024
申请日期
1991.02.21
申请人
NEC CORP
发明人
NISHIWAKI MITSUO
分类号
H04L9/20;H04L9/18
主分类号
H04L9/20
代理机构
代理人
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