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The Zelinsky-Kummant gas mask was the world's first gas mask [1] which had the ability to absorb a wide range of chemical warfare agents. The gas mask was developed in 1915 by Russian chemist Nikolay Zelinsky and technologist of the Triangle plant M.I. Kummant. [2] The design was later improved by I. D. Avalov and entered mass production.
The mask is constructed with black hair painted on the top of her head and 2 cords/strings hanging from the sides of the mask. Paekjung (the butcher): The mask has narrow eyes and a separate jaw, allowing the mask to have an evil grin when the actor leaned forward, and appear to be in maniacal laughter when leaning back. The hair and eyebrows ...
The venturi mask, also known as an air-entrainment mask, is a medical device to deliver a known oxygen concentration to patients on controlled oxygen therapy. [ 1 ] [ 2 ] The mask was invented by Moran Campbell at McMaster University Medical School as a replacement for intermittent oxygen treatment.
A sheet mask is a piece of paper, cellulose or fabric used to apply a facial mask. The first facial mask was invented in Ohio, United States , during the 19th century by Madame Rowley. It was called the "Toilet Mask" or the first "face glove", and was advertised as able to 'bleach, purify and preserve the complexion' of the skin.
A benefit of using phase-shift masks in lithography is the reduced sensitivity to variations of feature sizes on the mask itself. This is most commonly used in alternating phase-shift masks, where the linewidth becomes less and less sensitive to the chrome width on the mask, as the chrome width decreases.
Electrofusion pipe fitting. Electrofusion is a method of joining MDPE, HDPE and other plastic pipes using special fittings that have built-in electric heating elements which are used to weld the joint together.
Moisture is the presence of a liquid, especially water, often in trace amounts. Moisture is defined as water in the adsorbed or absorbed phase. [1] Small amounts of water may be found, for example, in the air , in foods, and in some commercial products. Moisture also refers to the amount of water vapor present in the air. The soil also includes ...
Therefore, the simple face mask is commonly preferred by basic life support personnel such as firefighters, lifeguards and other non-medical rescue personnel trained in basic first aid. [4] The final oxygen concentration delivered by a simple face mask is dependent upon the amount of room air that mixes with the oxygen the patient breathes.
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