Blackboard rubber made of, or including, metal
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United States of America Patent
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-
Oct 6, 1987
Grant Date -
N/A
app pub date -
Dec 27, 1985
filing date -
Jan 28, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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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