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↑  621.31                     electrical energy          → 333.7          ↑  621.312                          generation, transformation, accumulation                 ↑  621.317                          control devices                 ↑  621.319                          transmission, electrical plants

 
See also:

↑	333.7	natural resources, energy	→ 338.927  354  621.31  720.47
↑	AF7	congresses (electr. reliability)	≈ 620.11  621.31
↑	AP4	congresses (electrical devices)	≈ 621.31
↑	CE1	power stations	≈ 621.31
↑	CE2	wind power plants	≈ 621.31
↑	CE3	hydroelectric power stations	≈ 621.31
↑	CE4	nuclear power plants	≈ 621.31
↑	CE5	solar power plants	≈ 621.31
↑	CE6	thermoelectric power plants	≈ 621.31
↑	EE1	planning of energy production	≈ 621.31
↑	EE3	energy pricing	≈ 621.31
↑	EE4	congresses (el. energy)	≈ 621.31
	ET	general electrical engineering	≈ 621.31
↑	ET1	electrical CAD	≈ 621.31
↑	ET10	plasmas	≈ 621.31  530.44
↑	ET13	congresses (electronics)	≈ 621.31
↑	ET2	electric and magnetic fields	≈ 621.31
↑	ET3	linear and non-linear electric circuits	≈ 621.31
↑	ET4	electromagnetic compatibility for industrial engineering	≈ 621.31
↑	ET5	general electrical engineering	≈ 621.31
↑	ET8	design methods for electromechanical components	≈ 621.31
↑	ET9	modeling of electromechanical systems	≈ 621.31
	IP	Production plants	≈ 621.31
	LG	Electronics, information technology, electrical engineering	≈ 621.31
↑	TA1	high tension generators	≈ 621.31
↑	TA2	methods of measures in hight tension	≈ 621.31
↑	TA3	congresses (high tension technique	≈ 621.31