621.22 620.9 2 Exclude matching results 621.3 2 Exclude matching results elektrotechnika 2 Exclude matching results energetika 2 Exclude matching results 537 1 Exclude matching results 621.039 1 Exclude matching results 621.1 1 Exclude matching results 621.5 1 Exclude matching results 621.548 1 Exclude matching results 621.621 1 Exclude matching results automatizačná technika 1 Exclude matching results ekológia 1 Exclude matching results elektrická energia 1 Exclude matching results elektrárne 1 Exclude matching results energetická politika 1 Exclude matching results energetické hospodárstvo 1 Exclude matching results energetické strojárenstvo 1 Exclude matching results hydromechanika 1 Exclude matching results jadrová energia 1 Exclude matching results teplárenstvo 1 Exclude matching results