| |||
notch | |||
call sign | |||
marking signal |
标志信 号 : 27 phrases in 12 subjects |
Air defense | 1 |
Automobiles | 1 |
Communications | 4 |
Electricity | 1 |
Electronics | 1 |
General | 1 |
Geophysics | 1 |
Metallurgy | 1 |
Rail transport | 2 |
Road construction | 1 |
Technology | 10 |
Telecommunications | 3 |