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SLIDING OVER THE WAVES
Ships rise into the air. From the moment when the English hovercraft (SVP) CR.N1 in July 1959, crossed the 32-mile Strait of Dover (or the better-known us — Pas-de-Calais) between the...
TO HELP VALVE
For lifting of drinking water from boreholes and wells, often used external centrifugal pumps of the type "don" or "Kama". It is a reliable and high-performance mechanisms, but they have...
