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发明名称
ELECTRONIC BLACKBOARD
摘要
申请公布号
JPH0575755(A)
申请公布日期
1993.03.26
申请号
JP19920047619
申请日期
1992.02.04
申请人
RICOH CO LTD
发明人
YAMAMOTO KATSUHISA
分类号
B43L1/04;H04N1/00
主分类号
B43L1/04
代理机构
代理人
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