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Amazon.com : Pedal Power Bicycle Generator Emergency Backup Power System 500 Watts 12 Volts, 24 Volts, 48 Volts Direct Current Lead Acid Battery Charging System : Crank Generator : Patio, Lawn & Garden
Pedal powered farms and factories: the forgotten future of the stationary bicycle - LOW-TECH MAGAZINE
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Folding 20" Fat Tire Electric Bike 500W Hill Bicycle Removable Battery Pedal Assist Power - Walmart.com
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