light signal : 101 phrase in 14 subjects |
Aviation | 1 |
Chemistry | 1 |
Communications | 34 |
Construction | 3 |
Electronics | 5 |
General | 5 |
Labor law | 1 |
Life sciences | 1 |
Lighting other than cinema | 1 |
Rail transport | 6 |
Road works | 1 |
Telecommunications | 3 |
Transport | 38 |
Vacuum tubes | 1 |