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perforacion : 358 phrases in 42 subjects |
| Agriculture | 5 |
| Automated equipment | 13 |
| Botany | 1 |
| Cables and cable production | 2 |
| Chemistry | 9 |
| Coal | 43 |
| Communications | 9 |
| Construction | 10 |
| Cultural studies | 1 |
| Earth sciences | 16 |
| Economics | 4 |
| Electronics | 19 |
| Energy industry | 6 |
| Environment | 10 |
| Finances | 1 |
| Food industry | 1 |
| General | 5 |
| Health care | 16 |
| Hydrology | 1 |
| Industry | 15 |
| Information technology | 29 |
| Life sciences | 10 |
| Materials science | 3 |
| Mechanic engineering | 12 |
| Mechanics | 1 |
| Medical | 14 |
| Metallurgy | 17 |
| Milk production | 1 |
| Mining | 1 |
| Natural sciences | 4 |
| Oil / petroleum | 28 |
| Packaging | 4 |
| Patents | 1 |
| Politics | 2 |
| Soil science | 4 |
| Telegraphy | 3 |
| Textile industry | 2 |
| Thermal Energy | 1 |
| Transport | 19 |
| United Nations | 4 |
| Water resources | 3 |
| Work flow | 8 |