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Gear - Wikipedia
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How Gears Work | HowStuffWorks
Understanding Gears - Thomasnet
Gear Types, Design Basics, Applications and More - Basics of Gears
A Guide to Gears: 7 Gears, Their Traits, and How They Work
How Do Gears Work? | Simple Machines Science Projects
Gears and the Principles of Gear Systems - YouTube
How Gear Ratios Work | HowStuffWorks