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amplitud de : 27 phrases in 10 subjects |
| Antennas and waveguides | 1 |
| Electronics | 13 |
| Lighting other than cinema | 1 |
| Magnetics | 3 |
| Radio | 3 |
| Radiology | 1 |
| Sound recording | 1 |
| Telegraphy | 2 |
| Telephony | 1 |
| Video recording | 1 |
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