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  2. 3M - Wikipedia

    en.wikipedia.org/wiki/3M

    The N95 respirator mask was developed by 3M and approved in 1972. [114] Due to its ability to filter viral particulates, its use was recommended during the COVID-19 pandemic but supply soon became short. [114] Much of the company's supply had already been sold prior to the outbreak. [115]

  3. Mechanical filter (respirator) - Wikipedia

    en.wikipedia.org/wiki/Mechanical_filter_(respirator)

    Filtering half mask, reusable elastomeric respirator with pink replaceable pancake filters and grey exhalation valve Full-face elastomeric respirators seal better. [1] Mechanical filters, a part of particulate respirators, are a class of filter for air-purifying respirators that mechanically stops particulates from reaching the wearer's nose ...

  4. List of acquisitions by eBay - Wikipedia

    en.wikipedia.org/wiki/List_of_acquisitions_by_eBay

    As of September 2014, eBay has acquired over 40 companies, the most expensive of which was the purchase of Skype, a Voice over Internet Protocol company, for US$2.6 billion in cash plus up to an additional US$1.5 billion if certain performance goals were met. [2] The majority of companies acquired by eBay are based in the United States.

  5. Elastomeric respirator - Wikipedia

    en.wikipedia.org/wiki/Elastomeric_respirator

    Respirators used by welders must fit under a welding mask. [48] Respirators are also used in demolition to protect against asbestos, mould, and other hazardous waste. [49] Elastomeric respirators are used for cleaning up after oil spills. [50] Elastomeric respirators are used against chemical aerosols and toxic gases. [5]

  6. Escape breathing apparatus - Wikipedia

    en.wikipedia.org/wiki/Escape_breathing_apparatus

    Polish Au-2 escape respirator. Escape breathing apparatus, also called escape respirators, escape sets, self-rescuer masks, emergency life saving apparatus (ELSA), emergency escape breathing devices (EEBD), and Respiratory Protective Smoke Escape Devices (RPED), [1] [2] are portable breathing apparatus that provide the wearer with respiratory protection for a limited period, intended for ...

  7. Gas mask - Wikipedia

    en.wikipedia.org/wiki/Gas_mask

    A World War I British P Helmet, c. 1915 Zelinsky–Kummant protivogaz, designed in 1915, was one of the first modern-type full-head protection gas masks with a detachable filter and eyelet glasses, shown here worn by U.S. Army soldier (USAWC photo) Indian muleteers and mule wearing gas masks, France, February 21, 1940 A Polish SzM-41M KF gas mask, used from the 1950s through to the 1980s