verkningsgrad : 62 phrases in 13 subjects |
Agriculture | 1 |
Communications | 1 |
Earth sciences | 16 |
Electronics | 23 |
Energy industry | 5 |
Environment | 1 |
Health care | 1 |
Mechanic engineering | 4 |
Sound recording | 3 |
Technology | 1 |
Thermal Energy | 3 |
Transport | 1 |
Vacuum tubes | 2 |