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Lambertsen Amphibious Respiratory Unit : ウィキペディア英語版 | Lambertsen Amphibious Respiratory Unit The Lambertsen Amphibious Respiratory Unit (LARU, for short) is an early model of closed circuit oxygen rebreather, used by military frogmen. Christian J. Lambertsen designed a series of them in the USA in 1940 (patent filing date: 16 Dec 1940) and in 1944 (issue date: 2 May 1944).〔(Lambertsen's patent in ''Google Patents'' )〕 ==Etymology== The LARU is what the initials SCUBA (Self-Contained Underwater Breathing Apparatus) originally meant; Lambertsen changed his invention's name to SCUBA in 1952;〔(See Lambertsen's homage by the ''Passedaway.com'' website )〕 but later "SCUBA", gradually changing to "scuba", came to mean (first in the USA) any self-contained underwater breathing apparatus. (Modern diving regulator technology was invented by Émile Gagnan and Jacques-Yves Cousteau in 1943 and was not related to rebreathers; nowadays the word SCUBA is largely used to mean to Gagnan's and Cousteau's invention and its derivatives.)
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