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经营范围
发明名称
ELECTRONIC BLACKBOARD
摘要
申请公布号
JPH02127721(A)
申请公布日期
1990.05.16
申请号
JP19880281874
申请日期
1988.11.07
申请人
NEC CORP
发明人
TAKEMURA ATSUSHI
分类号
B43L1/04;G06F3/033;G06F3/041;G09G5/32;H04N1/00
主分类号
B43L1/04
代理机构
代理人
主权项
地址
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