إنحراف: 46 phrases in 12 subjects |
Antennas and waveguides | 1 |
Electric traction | 2 |
Electricity generation | 1 |
Electronics | 11 |
Isolation | 1 |
Lighting other than cinema | 5 |
Mathematics | 1 |
Power lines | 1 |
Sound recording | 2 |
Statistics | 6 |
Thermal Energy | 3 |
Vacuum tubes | 12 |