Agriculture	217
Animal husbandry	10
Antennas and waveguides	4
Astronautics	2
Astronomy	1
Automated equipment	65
Aviation	1
Building materials	1
Chemistry	48
Coal	14
Commerce	2
Communications	52
Computers	47
Construction	88
Earth sciences	48
Economics	16
Education	2
Electric machinery	8
Electric motors	3
Electric traction	8
Electrical engineering	3
Electricity generation	3
Electronics	160
Energy industry	35
Environment	27
Finances	7
Fish farming pisciculture	1
Food industry	25
Forestry	4
General	113
Health care	43
Hobbies and pastimes	5
Hydraulic engineering	1
Industry	49
Information technology	104
International Monetary Fund	2
International trade	1
Isolation	1
Labor law	26
Law	17
Life sciences	30
Lighting other than cinema	1
Magnetics	3
Marketing	25
Materials science	18
Measuring instruments	7
Mechanic engineering	79
Medical	51
Medical appliances	29
Metallurgy	62
Microsoft	16
Mineral products	2
Municipal planning	16
Natural resourses and wildlife conservation	28
Natural sciences	6
Nuclear and fusion power	1
Nuclear physics	5
Oil / petroleum	1
Packaging	11
Patents	9
Pharmacy and pharmacology	1
Plastics	1
Politics	3
Power electronics	2
Power lines	2
Power system protection	3
Pulp and paper industry	1
Radiation	4
Radio	1
Rail transport	1
Risk Management	2
Social science	3
Statistics	3
Technology	85
Telecommunications	26
Telephony	1
Textile industry	26
Thermal Energy	2
Thermal engineering	3
Transport	116
United Nations	5
Ventilation	1
Welding	8
Work flow	2