(english) Gears fitted to a machine to increase the number of spindle speeds obtainable with a cone or step pulley belt drive. ภาษาไทย ภาษาอังกฤษ Back Gears 0 0 ภาพประกอบ (english) Gears fitted to a machine to increase the number of spindle speeds obtainable with a cone or step pulley belt drive.
