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2. Photomask - Wikipedia

   en.wikipedia.org/wiki/Photomask

   In photolithography, several masks are used in turn, each one reproducing a layer of the completed design, and together known as a mask set. A curvilinear photomask has patterns with curves, which is a departure from conventional photomasks which only have patterns that are completely vertical or horizontal, known as manhattan geometry.

3. Respirator - Wikipedia

   en.wikipedia.org/wiki/Respirator

   Download as PDF; Printable version; ... single-use, disposable face masks, ... and full-face forms that cover the entire face. Half-face respirators are only ...

4. File:Ballistic mask.svg - Wikipedia

   en.wikipedia.org/wiki/File:Ballistic_mask.svg

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us

5. File:Understanding the difference between surgical masks and ...

   en.wikipedia.org/wiki/File:Understanding_the...

   This image is a work of the National Institute for Occupational Safety and Health, part of the Centers for Disease Control and Prevention in the United States Department of Health and Human Services, taken or made as part of an employee's official duties.

6. Emesa helmet - Wikipedia

   en.wikipedia.org/wiki/Emesa_helmet

   The face mask hangs from the head piece by a central hinge, and would be fastened with straps connecting a loop under each ear with corresponding holes in the neck guard. [ 1 ] [ 2 ] [ 3 ] The entire helmet, the iron core of which is between 1 and 6 millimetres thick, [ 4 ] weighs 2.217 kg (4.89 lb), of which the face mask comprises 982 g (2.16 ...

7. Non-invasive ventilation - Wikipedia

   en.wikipedia.org/wiki/Non-invasive_ventilation

   Non-invasive ventilation (NIV) is the use of breathing support administered through a face mask, nasal mask, or a helmet. Air, usually with added oxygen, is given through the mask under positive pressure; generally the amount of pressure is alternated depending on whether someone is breathing in or out.

8. Face mask - Wikipedia

   en.wikipedia.org/wiki/Face_mask

   Surgical mask; Cloth face mask; Dust mask; Diving mask, for use underwater; Facemask (orthodontics), used for correcting teeth misalignments; Facial mask, used for cosmetic skin treatment; Face mask (gridiron football), in sports; A mask for the face, typically used in rituals, performance art and as a disguise mostly during the Halloween holiday.

9. Face masks during the COVID-19 pandemic in the United States

   en.wikipedia.org/wiki/Face_masks_during_the...

   A public service announcement from the Government of California encouraging people to wear masks to "slow the spread". In late March 2020, some government officials began to focus on the wearing of masks to help prevent transmission of COVID-19 as opposed to protecting the wearer; former FDA Commissioner Scott Gottlieb stated in a report that face masks would be "most effective" at slowing its ...