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  1. But what if the purpose is to charge a phone? Sir, please kindly answer to my question, I know that you think the idea is ludicrous but i really need the answer. I humbly ask for your expertise on how did they manage to make the gear rotate Thank you for your generous answer
  2. in the video https://youtu.be/5PDc0LlacYk how did they manage to rotate the gear touching the piezo material when a force is applied to the tile? P.S. i am still a student of ME with limited resources
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