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dispositivo : 1213 phrases in 59 subjects |
| Agriculture | 22 |
| Antennas and waveguides | 1 |
| Brazil | 75 |
| Cables and cable production | 1 |
| Chemistry | 8 |
| Commerce | 1 |
| Communications | 72 |
| Construction | 5 |
| Earth sciences | 31 |
| Economy | 4 |
| Electric machinery | 2 |
| Electric traction | 5 |
| Electrical engineering | 31 |
| Electronics | 183 |
| Energy industry | 8 |
| Environment | 8 |
| European Union | 1 |
| Finances | 3 |
| Fish farming pisciculture | 1 |
| Food industry | 1 |
| Forestry | 4 |
| General | 61 |
| Health care | 15 |
| Hobbies and pastimes | 1 |
| Human rights activism | 4 |
| Industry | 46 |
| Information technology | 57 |
| Isolation | 1 |
| Labor law | 3 |
| Law | 5 |
| Life sciences | 6 |
| Lighting other than cinema | 1 |
| Magnetics | 5 |
| Materials science | 26 |
| Mechanic engineering | 104 |
| Medical | 9 |
| Metallurgy | 24 |
| Microsoft | 91 |
| Natural resourses and wildlife conservation | 1 |
| Natural sciences | 12 |
| Oil / petroleum | 1 |
| Patents | 27 |
| Pharmacy and pharmacology | 1 |
| Power electronics | 1 |
| Power lines | 1 |
| Power system protection | 2 |
| Radio | 4 |
| Radiology | 1 |
| Rail transport | 7 |
| Semiconductors | 11 |
| Statistics | 3 |
| Technology | 86 |
| Telecommunications | 1 |
| Telephony | 4 |
| Thermal Energy | 2 |
| Transformers | 5 |
| Transport | 109 |
| Vacuum tubes | 3 |
| Welding | 5 |
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