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经营范围
发明名称
ELECTRONIC BLACKBOARD
摘要
申请公布号
JPH02295271(A)
申请公布日期
1990.12.06
申请号
JP19890116384
申请日期
1989.05.09
申请人
NEC CORP
发明人
UENO KATSUHIKO
分类号
B43L1/04;H04N1/00;H04N1/04;H04N1/10;H04N1/107
主分类号
B43L1/04
代理机构
代理人
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