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OECD International Trade
International Trade By Commodity Statistics (SITC Rev. 3)
7: Machinery and transport equipment
73: Metal working machinery
731: Machine-tools working by removing material
7311: Machine-tools for working any material by removal
73112: Machine-tools operated by ultra-sonic processes
73112: Machine-tools operated by ultra-sonic processes
73112: Machine-tools operated by ultra-sonic processes
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