12 Nautical installations and structural parts for vessels, namely, rudders, rudders with twisted rudder blades; balance profile rudders, full-spade rudders, semi-spade rudders, rudders with or without articulated fins, rudder blades, steering nozzles; kort nozzles, kort nozzle rudders, bow thrusters, screw-propellers for boats, propeller nozzles, ducted propellers, transverse thrusters, guide devices for controlling propeller flow in ships, devices affecting propeller inflow, including nozzle rings and guide vanes for ships; rudder components, in particular rudder bearings, neck bearings, rudder shafts, rudder trunks, rudder supporting bearings, bearing bushes, axial bearings, radial bearings, sliding bearings, bearing rings, bearing housings, segments of bearing bushes or bearing rings, the aforesaid goods in particular being of plastic; components of kort nozzles or nozzle propellers, in particular rudder bearings, neck bearings, rudder shafts, rudder trunks, rudder supporting bearings, bearing bushes, axial bearings, radial bearings, sliding bearings, bearing rings, bearing housings, segments of bearing bushes or bearing rings, the aforesaid goods in particular being of plastic; components of articulated rudder fins, in particular fin joints, joint bushes, being of plastic