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| المركبة التوافقية ؛توافق | |||
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| توافقية | |||
| مركبة توافقية | |||
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| توافقية | |||
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| مركبة توافقية | |||
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harmonica : 70 phrases in 12 subjects |
| Electric motors | 2 |
| Electric traction | 1 |
| Electricity generation | 3 |
| Electronics | 5 |
| Magnetics | 8 |
| Mathematics | 30 |
| Piezoelectric crystals | 2 |
| Power electronics | 9 |
| Radio | 1 |
| Sound recording | 1 |
| Statistics | 6 |
| Telegraphy | 2 |