| http://www.w3.org/ns/prov#value | - The air, or other selected gas, is drawn through the gap by a propulsion jet plume, and escapes into the ambient water.It has been found desirable to minimize the downstream entrainment effect of the propulsion plume, to thereby minimize loss of air and to increase life expectancy of a reservoir of ventilation air on-board the vehicle.SUMMARY OF THE INVENTIONAn object of the invention is, therefor
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