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3323 Tecnología de los ferrocarriles (7)
3323 Tecnología ferroviaria (83)
3323 Tecnología ferroviaria: (1)
332302 Equipo ferroviario (51)
332303 Servicios de ferrocarril (7)
332304 Tránsito rápido (5)
332305 Material rodante (10)
3324 Tecnología espacial (1)
332404 Motores de cohete (1)
3325 Tecnología de las telecomunicaciones (80)
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