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发明名称
TOTAL STUDYING SYSTEM BLACKBOARD
摘要
申请公布号
KR900010647(Y1)
申请公布日期
1990.11.26
申请号
KR19870000918U
申请日期
1987.01.30
申请人
KOREA BLACK BOARD AND SCHOOL EQUIPMENT CO. LTD.
发明人
CHANG CHANG-HO
分类号
B43L1/04;(IPC1-7):B43L1/04
主分类号
B43L1/04
代理机构
代理人
主权项
地址
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