cloth face masks
... that cloth face masks were routinely used by surgeons before being replaced by modern surgical masks in the 1960s?
... that <b id="mwCjY"><a href="./Cloth_face_mask" id="mwCjc" rel="mw:WikiLink" title="Cloth face mask">cloth face masks</a></b> were routinely used by surgeons before being replaced by modern <a href="./Surgical_mask" id="mwCjg" rel="mw:WikiLink" title="Surgical mask">surgical masks</a> in the 1960s?