Example image of eyePlorer eyePlorer map for 'Case hardening': Alloy Carbon steel Hardening (metallurgy) Pattern welding Bloomery Cast iron Iron Wrought iron Forge Ductility Bone Charcoal Hoof Leather Salt Urine Bluing (steel) Firearm Replica Carbon monoxide Barium carbonate Common knowledge Hydroxylapatite Phosphorus Alloy steel Carbon Boride Boron Carburizing Nitriding Nitrogen Cyanide Ferrocyanide Induction heating Martensite Aluminium Chromium Molybdenum Austenite Ferrite (iron) Bolt (firearm) Camshaft Firing pin Self-tapping screw Ferritic nitrocarburizing Harvey armor Quench polish quench Hayward A. Harvey Mass finishing Pre-dreadnought battleship
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