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conduccion : 501 phrase in 54 subjects |
| Agriculture | 3 |
| Antennas and waveguides | 2 |
| Artillery | 7 |
| Automobiles | 1 |
| Chemistry | 8 |
| Coal | 5 |
| Communications | 7 |
| Computers | 1 |
| Construction | 2 |
| Criminal law | 2 |
| Earth sciences | 16 |
| Economics | 7 |
| Education | 1 |
| Electric machinery | 1 |
| Electric traction | 11 |
| Electronics | 63 |
| Energy industry | 2 |
| Environment | 6 |
| Forestry | 4 |
| General | 50 |
| Geology | 2 |
| Health care | 4 |
| Industry | 1 |
| Information technology | 4 |
| Insurance | 2 |
| Labor law | 6 |
| Law | 15 |
| Life sciences | 3 |
| Loading equipment | 5 |
| Magnetics | 2 |
| Materials science | 2 |
| Mechanic engineering | 31 |
| Medical | 41 |
| Metallurgy | 8 |
| Natural sciences | 11 |
| Nautical | 1 |
| Patents | 3 |
| Physical sciences | 3 |
| Piezoelectric crystals | 2 |
| Plumbing | 1 |
| Politics | 27 |
| Power electronics | 3 |
| Power system protection | 1 |
| Rail transport | 2 |
| Semiconductors | 1 |
| Spanish | 5 |
| Superconductivity | 1 |
| Technology | 14 |
| Textile industry | 3 |
| Thermal Energy | 1 |
| Transport | 86 |
| Vacuum tubes | 2 |
| Water resources | 8 |
| Weapons and gunsmithing | 1 |