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1. A type of gear with teeth that are not parallel to the gear's axis, but are instead at an angle.
2. A type of gear with teeth that are straight and parallel to the gear's axis.
3. A gear with a screw-like thread that meshes with a toothed wheel to provide high gear reduction ratios.
4. A set of two or more gears that transmit motion and torque from one shaft to another.
5. The ratio of the number of teeth of the driving gear to the number of teeth of the driven gear in a gear system.