发明名称 |
Blackboard rubber made of, or including, metal |
摘要 |
Blackboard rubber made of metal or having a metal base made up of two parts enclosed one within the other, the first part being in the form of a rectangular box and the second part being flat and forming a lid to the first part; the said second part comprises a centered metal plate and a magnet and is covered with a detachable rubbing sheet of soft material.
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申请公布号 |
US4697301(A) |
申请公布日期 |
1987.10.06 |
申请号 |
US19850814103 |
申请日期 |
1985.12.27 |
申请人 |
ALLIANCE ENAMELSTEEL CORPORATION S.A. |
发明人 |
PALMANS, JOS |
分类号 |
B43L21/00;(IPC1-7):B43L19/04 |
主分类号 |
B43L21/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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