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perforacion : 235 phrases in 29 subjects |
| Agriculture | 2 |
| Cables and cable production | 3 |
| Chemistry | 8 |
| Coal | 33 |
| Communications | 8 |
| Construction | 7 |
| Cultural studies | 1 |
| Earth sciences | 9 |
| Economics | 3 |
| Electronics | 12 |
| Energy industry | 2 |
| Environment | 12 |
| General | 1 |
| Health care | 8 |
| Industry | 13 |
| Information technology | 26 |
| Life sciences | 5 |
| Materials science | 2 |
| Mechanic engineering | 12 |
| Medical | 9 |
| Metallurgy | 16 |
| Natural sciences | 5 |
| Oil / petroleum | 19 |
| Patents | 1 |
| Semiconductors | 3 |
| Telegraphy | 1 |
| Thermal Energy | 1 |
| Transport | 12 |
| Work flow | 1 |