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  1. Drawing Gears with a Compass (simplified method) - YouTube

  2. How to draw spur gear by APROXIMATE METHOD - YouTube

  3. Involute spur gear generator and simulator

  4. The Involute Curve, Drafting a Gear in CAD and Applications

  5. Spur Gears - Geometry of spur gears and gear meshes

  6. Involute Spur Gear Builder - Hessmer

  7. 15. Spur Gears - Machine Drawing [Book] - O'Reilly Media