 |
| effetto: 30 phrases in 13 subjects |
| Antennas and waveguides | 2 |
| Electric traction | 1 |
| Electronics | 1 |
| Lighting other than cinema | 4 |
| Magnetics | 2 |
| Microsoft | 4 |
| Nuclear physics | 1 |
| Radio | 8 |
| Radiobiology | 3 |
| Sound recording | 1 |
| Telephony | 1 |
| Vacuum tubes | 1 |
| Video recording | 1 |