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Manufacturing and cutting of a gear shaft tooth on an oil-cooled gear cutting machine.
The septa, or gas filled chambers that controlled the buoyancy of this extinct Ammonite during it's life 100 million years ago have been filled with quartz crystals during fossilisation
Shaft gear with oblique involute tooth with nitrided surface.
Wooden gears on a wooden surface. Involute engagement.
Gear cutter. Cutting the tooth on the tooth with a slotting machine with oil cooling. Metal-working industry

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