gas helmet

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  • noun

Synonyms for gas helmet

a protective mask with a filter

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References in periodicals archive ?
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.' "But the gas didn't seem to have too bad an effect.
Just after that, we got an order to put on our gas helmets, as the Germans were shelling the road with gas shells.