Three-dimensional teaching device
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United States of America Patent
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Mar 22, 1983
Issued Date -
N/A
app pub date -
May 26, 1981
filing date -
May 26, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A three-dimensional device for teaching mathematical problems, comprising a stand having a number of open-ended shelves extending therefrom, the surfaces of said shelves being adapted to removably and interchangeably receive slides carrying different digits to set-up various mathematical problems, as conventionally done by paper and pen.
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