 |
| filament: 111 phrases in 16 subjects |
| Agriculture | 2 |
| Antennas and waveguides | 3 |
| Chemistry | 2 |
| Coal | 2 |
| Earth sciences | 6 |
| Electronics | 41 |
| General | 8 |
| Health care | 2 |
| Immigration and citizenship | 1 |
| Industry | 22 |
| Life sciences | 1 |
| Medical | 7 |
| Metallurgy | 1 |
| Natural sciences | 5 |
| Patents | 3 |
| Transport | 5 |