12 Structural parts of nautical vehicles, namely, control installations in the form of thrust control levers, steering installations in the form of steering wheels, helms and hydraulic installations, rudders, rudders with twisted rudder blades, balanced-profile rudders, full spade rudders, semi-spade rudders, rudders with and without articulated fins, rudder blades, steering nozzles, kort nozzles, kort steering nozzles, steel bow rudders, propellers, propeller nozzles, nozzle propellers, transverse thrusters, guide devices to affect propeller flow in ships, devices affecting propeller inflow, namely, guide-vane rings and propeller blade protectors for boats in the form of guide collars and guide blades 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, hinges, bearing bushes, the aforesaid goods in particular being of plastic; prefabricated parts of plastic for manufacturing sliding elements being parts of rudder assemblies for marine vehicles