$10,12Marble Binary Adding Machine - Mechanical Computer with Flip-Flops, Adds A + B, Educational STEM ToyCults3D
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$10,12/https://fbi.cults3d.com/uploaders/22437122/illustration-file/3bf6d014-14d7-4c94-a695-b1881eb45066/PXL_20240726_121331472.jpg)
