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| segnale unidirezionale | |||
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unidirectional : 25 phrases in 13 subjects |
| Agriculture | 1 |
| Automated equipment | 1 |
| Chemistry | 3 |
| Communications | 3 |
| Electronics | 5 |
| General | 1 |
| Industry | 2 |
| Information technology | 2 |
| Mechanic engineering | 1 |
| Medical | 3 |
| Piezoelectric crystals | 1 |
| Technology | 1 |
| Transport | 1 |