|
Shields : 107 phrases in 17 subjects |
| Cables and cable production | 9 |
| Childish | 3 |
| Construction | 5 |
| Electric machinery | 5 |
| Electric traction | 3 |
| General | 48 |
| Geography | 1 |
| Historical figure | 1 |
| Isolation | 1 |
| Lighting other than cinema | 1 |
| Nuclear physics | 1 |
| Physics | 7 |
| Power lines | 1 |
| Superconductivity | 1 |
| Technology | 16 |
| Thermal Energy | 1 |
| Vacuum tubes | 3 |