very-low -frequency : 58 phrases in 13 subjects |
Electronics | 7 |
Geophysics | 10 |
Household appliances | 1 |
Makarov | 5 |
Metrology | 1 |
Military | 10 |
Nautical | 1 |
Oil / petroleum | 1 |
Physics | 2 |
Programming | 1 |
Seismology | 1 |
Technology | 13 |
Telecommunications | 5 |