Classification
TEF - Electric machines, electric cables
TAT - Engineering Standards
10
TEA - Electrical engineering - general
5
THH - Machines
5
YFF - Industrial safety regulations
3
THD - Design and construction in mechanical engineering
2
THHD - Machine parts
2
TEDF - Electric power application
1
TIF - Industrial ( occupational ) safety
1
TIG - Reliability, safety, quality control
1
UAU - Fire, fire protection, safety at the workplace, prevention of accidents
1