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发明名称
ELECTRONIC BLACKBOARD
摘要
申请公布号
JPS6475297(A)
申请公布日期
1989.03.20
申请号
JP19870232876
申请日期
1987.09.17
申请人
RICOH CO LTD
发明人
FUKUSHIMA TAKASHI
分类号
B43L1/04;H04N1/00
主分类号
B43L1/04
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