K'NEX Ellipsograph bug

作者：Michael Borcherds

K'NEX Ellipsograph

Image from http://tinas-sliderules.me.uk/Slide%20Rules/KNexEllipsograph.JPG" target="_blank" rel="noreferrer">http://tinas-sliderules.me.uk/Slide%20Rules/KNexEllipsograph.JPG

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