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Pulling-whistile was a toy in our childhood.It rotates the disk quickly by the wrapping thread.Pulling-whistile emergency portable source combines the pulling-whistile and portable sourse.When we can’t get way ogcharging we could use it.It transforms the mechanical energy into electric energy.And what’s more,we may hear the sound of wind.
Chunlei Shi Wei Shang Tianyu Li Xudian Guan