Teaching aid
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United States of America Patent
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Jan 13, 2004
Grant Date -
Aug 7, 2003
app pub date -
Dec 17, 2002
filing date -
Mar 8, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A teaching aid comprises a frame (1), a plurality of elongate rods (2) mounted horizontally in the frame and spaced vertically from each other and a plurality of polyhedral blocks (3) rotatably mounted on each rod. Means are provided to releasably hold each block (3) in at least three discrete rotary positions on its respective rod (2).
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