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zjawisko : 73 phrases in 11 subjects |
| Antennas and waveguides | 13 |
| Electric traction | 2 |
| Environment | 3 |
| Lighting other than cinema | 8 |
| Magnetics | 26 |
| Piezoelectric crystals | 1 |
| Radio | 1 |
| Semiconductors | 9 |
| Sound recording | 2 |
| Thermal Energy | 4 |
| Vacuum tubes | 4 |
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