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发明名称
Ascendable blackboard
摘要
申请公布号
SG76520(A1)
申请公布日期
2000.11.21
申请号
SG19970002349
申请日期
1997.07.02
申请人
JANG CHANG-HO
发明人
JANG CHANG-HO
分类号
B43L1/00;B43L1/04;(IPC1-7):B43L1/04
主分类号
B43L1/00
代理机构
代理人
主权项
地址
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