Machines in the nature of pumps and motors for transforming mechanical energy into hydrostatical energy or vice versa; hydraulic aggregates, namely, power packs for industrial and mobile applications; pumps, namely, [ electric, electromagnetic, pneumatic or ] hydraulic pumps, preferably fluid pumps, particularly machine-powered fluid pumps, [ water-hydraulic pumps, ] and parts thereof; [ piston pumps, namely, radial or axial piston pumps; ] gear pumps, namely, internal-gear pumps [ or external-gear pumps; electric, electromagnetic, pneumatic or hydraulic pumps for automobile applications, particularly for break hydraulics; automotive automatic transmissions; oil feed pumps, suction pumps and accumulator charging units for gasoline and diesel high-pressure apparatuses and equipment; reversible hydraulic machines which operate as pump and as motor bidirectionally, for active suspension and suspension equipment; hydraulic steering boosters, and parts thereof; ] hydraulic pumps for industrial applications, namely, pumps for presses, tube bending apparatuses and edging-shears; hydraulic pumps for mobile applications, particularly hydraulic pumps for fork lift trucks for lifting, shifting and tilting the mast; [ electromagnetic pumps for heating, refrigerating, drying, ventilating, air-conditioning apparatuses and apparatuses for water supply purposes; solar pumps, rotary vane pumps, oscillating piston pumps, centrifugal pumps, vane pumps, electromagnetic pumps, suction pumps, pressure pumps, condensate pumps, membrane pumps, diaphragm pumps, hose pumps, dosing pumps, hydraulic pressure vessels, and parts thereof; central oil-supply equipment and oil-conveying equipment, essentially consisting of electric pumps for the central supply of oil stoves; electric pumps for the central supply of oil for oil burners and oil stoves, oil burner pumps; ] motors, particularly hydraulic motors, and parts thereof; pumps and motors for stationary or mobile applications, namely, hydropumps and hydromotors; fluidic internal-gear pumps, particularly pumps and motors, and parts thereof; couplings for machines; shaft couplings; hydraulic quick-disconnect couplings for machines; components for use in machines for controlling and regulating engine apparatuses for transforming mechanical energy into hydrostatical energy or vice versa, namely, valves, armatures, hydraulic accumulators; hydraulic pressure switches; hydraulic controls for machines; hydraulic valves for machines; pressure valves for machines; pressure relief valves for machines