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Nautical thruster, characterized essentially by the fact that it comprises two small floats fixed to the ends of a shaft provided with two bends in opposite directions as a crankshaft, provided with freely rotating handles for its operation, whose floats are provided with a plurality of radial blades, so that the rotation of the tree determines the one of the floats and the corresponding impulsion of the apparatus thanks to the float paddles, part of which are always submerged. (Machine-translation by Google Translate, not legally binding)
Device for the stepless adjustment of impeller or stator blades of centrifugal machines, such as centrifugal pumps, axial turbines, ship propellers or the like.