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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.
The costs of creating new mask shop for 180 nm processes were estimated in 2005 as $40 million, and for 130 nm - more than $100 million. [26] The purchase price of a photomask, in 2006, could range from $250 to $100,000 [27] for a single high-end phase-shift mask. As many as 30 masks (of varying price) may be required to form a complete mask set.
The economist Alex Tabarrok has argued, that the success of this promotion lies in the fact that consumers value the first unit significantly more than the second one. So compared to a seemingly equivalent "Half price off" promotion, they may only buy one item at half price, because the value they attach to the second unit is lower than even the discounted price.
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Exemptions include those at protests wearing masks for professional or paid work, or for religious or medical reasons. In addition, the law states that anyone who disobeys a police order to remove a mask could be sentenced to six months in jail and a HK$10,000 fine. Paint is also included in the definition of "face-covering". The legislation ...
The costume is also associated with a commedia dell'arte character called Il Medico della Peste ('The Plague Doctor'), who wears a distinctive plague doctor's mask. [37] The Venetian mask was normally white, consisting of a hollow beak and round eye-holes covered with clear glass, and is one of the distinctive masks worn during the Carnival of ...
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