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3D printing (2)
512 - Algebra (2)
53 - Physics (2)
531/534 - Mechanics (2)
536 - Heat. Thermodynamics. Statistical physics (2)
546 - Inorganic chemistry (2)
572 - Physical anthropology (2)
614 - Public health and hygiene. Accident prevention (2)
616.7 - Pathology of the organs of locomotion. Skeletal and locomotor systems (2)
621.3 Electrical engineering (2)