gas helmet

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Noun1.gas helmet - a protective mask with a filtergas helmet - a protective mask with a filter; protects the face and lungs against poisonous gases
mask - a protective covering worn over the face
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The trenches were built, and May 29 records they 'put on gas helmets and were subjected to poison gas for quarter of an hour in a closed room.
Just after that, we got an order to put on our gas helmets, as the Germans were shelling the road with gas shells.