subaudio
| subaudio | |
| tech. | infraakustisch; unterhoerfrequent |
| |||
| infraakustisch; unterhoerfrequent | |||
|
subaudio : 10 phrases in 5 subjects |
| General | 1 |
| Measuring instruments | 1 |
| Optics branch of physics | 1 |
| Physics | 1 |
| Technology | 6 |