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make a buwsiness around the idea of a wind up generator that is like and old gramophone type motor you wind it and it will give electricity for a few hours and then rewind for 2 min or whatever and the higher models will have less wind time and more run time. it will be about the size of a phone. dosent matter about pohysics or aything just a business plan for school assesment .
Order from us for quality, customized work in due time of your choice.