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Hypo helmet
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<p>The Hypo helmet, or British Smoke Hood (its official name), was an early British <a href="/facts/World_War_I/vITTUanQ">World War I</a> <a href="/facts/Gas_mask/1I8Y1wSs">gas mask</a>, designed by <a href="/facts/Cluny_Macpherson_(physician)/Kqd7AX6o">Cluny Macpherson</a>. </p>