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signal light: 98 phrases in 18 subjects |
Automobiles | 2 |
British usage, not spelling | 1 |
Chemistry | 1 |
Communications | 33 |
Construction | 4 |
Economy | 2 |
Electronics | 7 |
General | 1 |
Lighting other than cinema | 1 |
Nuclear physics | 1 |
Optics branch of physics | 2 |
Rail transport | 11 |
Road works | 1 |
Technology | 1 |
Telecommunications | 2 |
Transport | 25 |
Vacuum tubes | 1 |
Weapons and gunsmithing | 2 |