supplied-air respirators
... that supplied-air respirators, unlike N95 masks, can be used in atmospheres that are oxygen-deficient or immediately dangerous to life or health?
... that <b id="mwBmQ"><a href="./Supplied-air_respirator" id="mwBmU" rel="mw:WikiLink" title="Supplied-air respirator">supplied-air respirators</a></b>, unlike <a class="mw-redirect" href="./N95_mask" id="mwBmY" rel="mw:WikiLink" title="N95 mask">N95 masks</a>, can be used in atmospheres that are oxygen-deficient or <a href="./Immediately_dangerous_to_life_or_health" id="mwBmc" rel="mw:WikiLink" title="Immediately dangerous to life or health">immediately dangerous to life or health</a>?