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SIGNALLING STRUCTURE |
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| SN | Buildings and structures associated with signal communication. |
| CL |
COMMUNICATIONS |
| NT |
AIRFIELD CODE LETTERS
BEACON FOG HORN HOOTER LIGHTHOUSE RAILWAY SIGNAL SEMAPHORE STATION SHUTTER TELEGRAPH STATION SIGNAL BOX SIGNAL POST SIGNAL SQUARE SIGNAL STATION SIGNAL TOWER SIGNALLING BATTERY TRAFFIC LIGHTS WARNING SIREN |
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