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The word SCUBA was coined in 1952 by Major Christian Lambertsen who served in the U.S. Army Medical Corps from 1944 to 1946 as a physician. [1] Lambertsen first called the closed-circuit rebreather apparatus he had invented "Laru", an (acronym for Lambertsen Amphibious Respiratory Unit) but, in 1952, rejected the term "Laru" for "SCUBA" ("Self-Contained Underwater Breathing Apparatus"). [2]
DACOR Corporation was a former American manufacturer of scuba diving equipment which was founded in 1954 by Sam Davison Jr. in Evanston, Illinois as "The Davison Corporation". Since its foundation. DACOR was one of the five early American diving equipment manufacturers. Together, they were: DACOR; U.S. Divers (Now Aqua-Lung)
The mask of Tutankhamun is a gold funerary mask of the 18th-dynasty ancient Egyptian pharaoh Tutankhamun (reigned 1334–1325 BC). After being buried for over 3,000 years, it was excavated by Howard Carter in 1925 from tomb KV62 in the Valley of the Kings. It has been displayed in the Egyptian Museum in Cairo from 1925 to present.
During the COVID-19 pandemic, masks with unfiltered-exhalation valves ran counter to the requirements of some mandatory mask orders. [ 60 ] [ 61 ] Despite the aforementioned belief, a 2020 research by the NIOSH and CDC shows that an uncovered exhalation valve already provides source control on a level similar to, or even better than, surgical ...
The lifetime ownership cost of the mask was reduced by 50% when compared with the M40 series mask due to a lower repair part count, all maintenance being completed at the operator and unit level and color coding of repair parts which decreased on-hand repair part inventory. [7] United States Marine Corps member is wearing a M50 mask
The earliest of these breathing sets may have been modified Davis Submerged Escape Apparatus; their fullface masks were the type intended for the Siebe Gorman Salvus, but in later operations different designs were used, leading to a fullface mask with one big face window, at first circular or oval and later rectangular (mostly flat, but the ...
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