Fraction Adding Machine
Evil Mad Scientist Laboratories has a DIY for making your own Fraction Adding Machine out of a Rice Krispies Box, glue and tape. It’s based on an actual 1952 calculator.

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Evil Mad Scientist Laboratories has a DIY for making your own Fraction Adding Machine out of a Rice Krispies Box, glue and tape. It’s based on an actual 1952 calculator.
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