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History
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Iron gears, Han dynasty
Iron gears, Han dynasty
Wooden cogwheel driving a lantern pinion or cage gear
Wooden cogwheel driving a lantern pinion or cage gear
A cast gearwheel (above) meshing with a cogged mortise wheel (below). The wooden cogs are held in place by nails.
A cast gearwheel (above) meshing with a cogged mortise wheel (below). The wooden cogs are held in place by nails.
Helical gears Top: parallel configuration Bottom: crossed configuration
Helical gears Top: parallel configuration Bottom: crossed configuration
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NSK Support Roller cut (cropped)
NSK Support Roller cut (cropped)