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TJ0212 Control engineering systems. Automatic machinery (General)
G0575 Arctic and Antarctic regions
1
HE9719 Artificial satellite telecommunications
1
T0059.5 Automation
1
T0059.7 Human engineering in industry. Man-machine systems
1
TA0168 Systems engineering
1
TD0172 Environmental pollution
1
TJ0163.13 Power resources
1
TJ0163.26 Energy conservation
1
TJ0807 Renewable energy sources
1
TJ0810 Solar energy
1
TJ0820 Wind power
1
TJ0828 Wind turbines
1
TK0452 Electric apparatus and materials. Electric circuits. Electric networks
1
TK1001 Production of electric energy or power
1
TK3001 Distribution or transmission of electric power
1
TK4001 Applications of electric power
1
TK4601 Electric heating
1
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