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经营范围
发明名称
ELECTRONIC BLACK BOARD
摘要
申请公布号
JPH04212189(A)
申请公布日期
1992.08.03
申请号
JP19910018937
申请日期
1991.02.12
申请人
SONY CORP
发明人
KAKINUMA KOICHIRO
分类号
B43L1/04;G03G15/20;G03G15/22;H04N1/00
主分类号
B43L1/04
代理机构
代理人
主权项
地址
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