identification signals: 40 phrases in 13 subjects |
Aviation | 1 |
Computer networks | 2 |
Computers | 1 |
Electronics | 3 |
Household appliances | 1 |
Information technology | 3 |
Makarov | 1 |
Mass media | 8 |
Mathematics | 1 |
Military | 5 |
Technology | 7 |
Telecommunications | 2 |
Television | 5 |