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  2. Face masks during the COVID-19 pandemic - Wikipedia

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

    During the COVID-19 pandemic, face masks or coverings, including N95, FFP2, surgical, and cloth masks, have been employed as public and personal health control measures against the spread of SARS-CoV-2, the virus that causes COVID-19 . In community and healthcare settings, the use of face masks is intended as source control to limit ...

  3. Photomask - Wikipedia

    en.wikipedia.org/wiki/Photomask

    A schematic illustration of a photomask (top) and an IC layer printed using it (bottom) A photomask (also simply called a mask) is an opaque plate with transparent areas that allow light to shine through in a defined pattern. Photomasks are commonly used in photolithography for the production of integrated circuits (ICs or "chips") to produce a ...

  4. Hahoetal - Wikipedia

    en.wikipedia.org/wiki/Hahoetal

    Kaksi being carried to the performance. Paekjung in performance. Hahoetal ( Korean : 하회탈) are traditional Korean masks worn in the Hahoe byeolsingut talnori ceremonies that date back to the 12th century. [ 1] They represent the stock characters needed to perform the roles in the ritual dance dramas included in the ceremony.

  5. Bahtinov mask - Wikipedia

    en.wikipedia.org/wiki/Bahtinov_mask

    Bahtinov mask. The Bahtinov mask is a device used to focus small astronomical telescopes accurately. Although masks have long been used as focusing aids, the distinctive pattern was invented by Russian amateur astrophotographer Pavel Bahtinov ( Russian: Павел Бахтинов) in 2005. [ 1][ 2] Precise focusing of telescopes and ...

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  7. 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 ...

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