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AIRFIELD DEFENCE SITE |
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| SN | A site or building associated with active or passive defence of the landing ground and buildings of an airfield. |
| CL |
MILITARY DEFENCE AND FORTIFICATION |
| BT | DEFENCE SITE |
| NT |
ANTI LANDING OBSTACLE
BATTLE HEADQUARTERS BISON MOBILE PILLBOX PICKETT HAMILTON FORT PILLBOX (AIR MINISTRY PATTERN) SEAGULL TRENCH |
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