Air filters for mechanical purposes; Air hoses being replacement parts of compressed air machines; Automatic swimming pool cleaners and parts therefor; Belts for engines; Belts for machines; Power-operated grass/weed trimmers; Power transmission belts for machines; Pressure switches being replacement parts of compressed air machines; Self-lubricating mechanical friction parts, especially of composite materials, namely, wear rings, washers, bushings, spherical bearings, bearing pads, sliding b...