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The Calibron 12-Block Puzzle
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Originally copyrighted in 1932 by the son of Thomas Edison, this puzzle has been unavailable for over half a century. Can you assemble the 12 blocks into a single, solid rectangle? Just how easy a puzzle do you think an Edison would design?
The Calibron 12-Block Puzzle
12 pieces, about 6.5 inches square altogether
Difficulty: (Extreme)
$25 each