1.Bevel Gears 2.Crown Wheel and Pinion 3.Cycloidal Gears 4.Differential Gears 5.External Gear 6.Face Gear 7.Fine Pitch Gears 8.Gear Trains 9.Girth Gears 10. Ground Gear 11. Hardened and Ground Gears 12. Helical Bevel Gears 13. Helical Gears 14. Herringbone Gears 15. Idler Gear 16. Internal Gears 17. Involute Gears 18. Involute Gears 19. Mill Headers