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|
harmonica : 150 phrases in 25 subjects |
| Communications | 21 |
| Cultural studies | 3 |
| Earth sciences | 2 |
| Electric motors | 1 |
| Electric traction | 1 |
| Electricity generation | 2 |
| Electronics | 53 |
| Energy industry | 1 |
| General | 4 |
| Industry | 1 |
| Information technology | 3 |
| Life sciences | 2 |
| Magnetics | 6 |
| Mathematics | 26 |
| Mechanic engineering | 3 |
| Medical | 1 |
| Metallurgy | 3 |
| Pharmacy and pharmacology | 1 |
| Piezoelectric crystals | 1 |
| Power electronics | 3 |
| Radio | 1 |
| Sound recording | 1 |
| Statistics | 7 |
| Technology | 1 |
| Telegraphy | 2 |