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| pure tones | |||
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| clean tone | |||
| pure color | |||
| pure tone (одной частоты, не содержащий гармоник); pure audio-frequency tone (одной частоты, не содержащий гармоник) | |||
| pure sound; pure tone; simple tone; single-frequency tone | |||
| чистые тона: 18 phrases in 9 subjects |
| Aviation | 3 |
| Electronics | 5 |
| Makarov | 1 |
| Medical | 2 |
| Metrology | 2 |
| Occupational health & safety | 1 |
| Physics | 1 |
| Technology | 2 |
| Telecommunications | 1 |
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