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PASSIVE AIR DEFENCE SITE |
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| SN | Sites, buildings or structures involved in passive air defence, usually by forcing hostile aircraft to fly high or drop their bombs on the wrong targets. Use more specific term. |
| CL |
MILITARY DEFENCE AND FORTIFICATION |
| BT | AIR DEFENCE SITE |
| NT |
ANTENNA ARRAY
RADAR STATION RADIO TELEGRAPHY STATION ROYAL OBSERVER CORPS SITE SOUND MIRROR |
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