Calibron 12 Puzzle of The Week Feature

This week's puzzle feature is on the Calibron 12. Out of all of our different brain teasers I rank the Calibron 12 in the top 5 in terms of difficulty. With that being said it is a wonderful puzzle because the concept is so simple. All you need to do is fit each of the 12 pieces in the available space. It is the type of brainteaser anyone can try, but very few will actually solve without assistance from the instructions.

The puzzle also has a pretty interesting:

Originally designed in 1933 by Theodore Edison, son of the famous inventor Thomas Edison, and made by his company Calibron Products of West Orange, N.J.   It was offered as just pieces and you were told they made a rectangle and there was only 1 solution.  

A friend of my Dad actually performed a computer analysis on the puzzle to verify this. It turns out the only possible solution is a square shape, as verified by Ken Irvine's computer analysis. Ken is working on a full analysis of the puzzle, with ex

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