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发明名称
CHALK DUST REMOVAL DEVICE FOR BLACKBOARD
摘要
申请公布号
JPH06239096(A)
申请公布日期
1994.08.30
申请号
JP19930025124
申请日期
1993.02.15
申请人
HITACHI LTD
发明人
NAYA KOTARO;FUJISAWA FUCHIO;MIHASHI SHINJI
分类号
B43L21/02;(IPC1-7):B43L21/02
主分类号
B43L21/02
代理机构
代理人
主权项
地址
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