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action adjustment Air Raid Air Raid Precautions aircraft answer anti-gas attack Babies battery black-out blackboard blast blister gas Bomb Disposal brake breathing buildings cable camouflet carburettor carton casualties cause choke Civil Defence personnel Civil Defence services civilian respirators clean clothing container cooling cover crater damage danger decontamination effective enemy engine ensure eyepieces facepiece feet filter fire fitted fragments fuse g.p.m. unit gases give hand haversack head harness helmet high explosive high explosive bombs hose hydrogen cyanide ignition incendiary bombs inches instruction instructor lecture lever Lewisite light liquid lubricated machine gun material methods minutes Motor mustard gas necessary operation patient penetration person Phosphorus Plate points position possible precautions pressure protection questions remove running Service Respirator shells shelter side stirrup pump suction surface tank Thermite throttle thumb tion trailer pumps unexploded bomb Warden wire