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Emile Gagnan

French engineer. Co-inventor (together with Jacques Cousteau) of the demand-valve used for the first Scuba equipment ("Aqua-Lung"). The demand-valve was designed for regulating gas in gas-generator engines, but was found to be excellent for regulating air-supply under variating pressure conditions.

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... of a V + a, and the vrdhii grade vowel as V + aa. One other notable feature of the nominal system is the very common use of nominal compounds, which may be huge ...