controllo sulla validità dei dati in ingresso

Accounting	65
Acoustics	1
Agriculture	170
Animal husbandry	2
Antennas and waveguides	2
Astronautics	1
Automated equipment	84
Automatic control	71
Aviation	23
Business	2
Chemistry	42
Coal	2
Commerce	24
Communications	415
Computer numerical control	47
Computers	12
Construction	10
Corporate governance	1
Criminal law	6
Cultural studies	4
Customs	6
Data processing	1
Demography	1
Dyalysis	1
Earth sciences	57
Economy	76
Education	6
Electric traction	2
Electronics	229
Energy industry	13
Environment	119
European Union	1
Finances	167
Fish farming pisciculture	10
Food industry	7
Food service and catering	7
General	325
Government, administration and public services	2
Health care	93
Hobbies and pastimes	5
Human rights activism	6
Immigration and citizenship	15
Industry	50
Information technology	652
Insurance	11
International trade	1
Labor law	14
Law	170
Librarianship	2
Life sciences	16
Loading equipment	3
Magnetics	8
Marketing	16
Materials science	26
Mathematics	20
Measuring instruments	77
Mechanic engineering	137
Medical	84
Metallurgy	46
Mexican	1
Microsoft	226
Name of organization	6
Natural sciences	28
Nuclear and fusion power	4
Nuclear physics	15
Obsolete / dated	2
Packaging	15
Patents	37
Pharmacy and pharmacology	22
Politics	23
Power electronics	14
Power lines	5
Radio	26
Rail transport	18
Satellite communications	2
Semiconductors	6
Social science	12
Sound recording	2
Statistics	49
Taxes	11
Technology	56
Telecommunications	4
Telegraphy	19
Textile industry	90
Thermal Energy	1
Trade unions	1
Transformers	1
Transport	410
United Nations	11
Veterinary medicine	3
Video recording	2
Welding	1
Work flow	11