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Shaft seals, bearing housings, headwheels and cable pulleys, crank shafts; single and double mechanical seals with gas or liquid lubrication for sealing liquid or gaseous media; cassette-type mechanical seals; mechanical seals with confining fluid seals; mechanical seals with a flushing function; mechanical seals with leakage recirculation; mechanical seals with leakage control; all the aforesaid goods being parts of machines; mechanical apparatus and devices for storage, pressurisation, circulation and/or temperature control of fluids for use in mechanical seals; mechanical apparatus and devices, namely buffer pressure units, fluid refill units, fluid circulation units, separators for impurities, apparatus and devices for collecting leakages; gas supply devices (parts of machines) for mechanical seals with gas lubrication; mechanical seals of all kinds, in particular mechanical seals, labyrinth seals. Packing and stopping materials, sealing rings, lip seals, gap seals, gland seals, seals for rotary kilns. Installation and maintenance of mechanical seals.