Who Invented Gears?
Por um escritor misterioso
Descrição
Today’s Wonder of the Day really kicks things into high gear!
Gear - Wikipedia
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Brian Zweerink's Awesome Blog: Making gears for 3D printing using
Who Invented Gears?
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engineer-mechanical:inventor-gears - Jeffery J Jensen Wiki
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por adulto (o preço varia de acordo com o tamanho do grupo)
