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Karácsonyi angyal - balansz lemezből

12,650 Ft
Model: chr-0009
Availability: Elfogyott


Christmas decoration

Perpetual motion describes "motion that continues indefinitely without any external source of energy; impossible in practice because of friction." It can also be described as "the motion of a hypothetical machine which, once activated, would run forever unless subject to an external force or to wear".


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