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projecção : 23 phrases in 10 subjects |
| Antennas and waveguides | 1 |
| Lighting other than cinema | 1 |
| Mathematics | 4 |
| Patents | 3 |
| Radiology | 7 |
| Satellite communications | 3 |
| Statistics | 1 |
| Thermal Energy | 1 |
| Vacuum tubes | 1 |
| Video recording | 1 |
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