Process of carburizing and carbonitriding, quenching and tempering of iron and steel
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Process of nitriding and nitrocarburizing of iron and steel (Amendment 1)
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Process of nitriding and nitrocarburizing of iron and steel
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Classification and water resistibility of water resistant watches for general use
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Water resistant watches for general use -- Classification and water resistibility
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Diver's watches -- Classification and performance
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Divers' watches -- Classification and performance (Foreign Standard)
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Divers' watches -- Classification and performance
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Horology -- Magnetic resistant watches -- Classification and performance
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