How Draw Bridges Work
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Clip 1:32 How Draw Bridges Work Have you been stuck in traffic waiting for a drawbridge. Have you ever stopped to wonder what it takes to move a bridge? Learn more in this HowStuffWorks video "How Draw Bridges Work." Credits: , HowStuffWorks
balance, balanced, balancing, bridges, draw bridges, drawbridges, educational, engineering, gates, gears, learning, lifting, lifts, motors, safety, safety equipments, shafts, simple machines, technology, traffics, warnings, waters
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