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经营范围
发明名称
Ascendable blackboard.
摘要
申请公布号
ZA9705972(B)
申请公布日期
1998.04.29
申请号
ZA19970005972
申请日期
1997.07.04
申请人
CHANG-HO JANG
发明人
CHANG-HO JANG
分类号
B43L;B66F
主分类号
B43L
代理机构
代理人
主权项
地址
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