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English: Small crank driven dynamo flashlight, with the case open to show mechanism. This is a flashlight powered by human muscle power. The 2 LED lamps (top left) are powered by a battery (center left) which is charged by the electric generator (lower left) turned by the crank (right) through the 70:1 reduction gear train. Turning the crank at 60 rpm turns the generator at 4000 rpm. A few minutes of cranking probably provides 10-15 minutes of light.
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