Puzzle Model - Stem Lab Differential hair clip Number of parts: 198

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Puzzle Model - Stem Lab Differential hair clip Number of parts: 198Create for yourself an engineering marvel with the UGears STEM LAB . This device counts repeated actions with a click button and cylindrical numbered gears. You might see someone using a device like this at the gates of an amusement park or the entryway of a theater to count the number of people entering. This kind of counter is also a crucial part of the modern odometer, found in every car. However, with this home built model Counter, the limit to

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