7 Machine parts particularly for the metal, wood, plastic, paper, leather and artificial leather processing industries, namely, oil filters, air filters for mechanical purposes, fuel filters, bushings and bearings, mechanical seals, transmission seals, engine seals, hoods, cam covers, engine covers, brake linings for machines, roller bearings, conveyor rollers, rollers for printing machines; Machine parts particularly for the chemical and pharmaceutical industries, food producing and processing industries, namely, oil filters, air filters for mechanical purposes, fuel filters, bushings and bearings, mechanical seals, transmission seals, engine seals, hoods, cam covers, engine covers, brake linings for machines, roller bearings, conveyor rollers, rollers for printing machines; Machine parts particularly for the textile, glass and ceramic, building, paper and printing industries, namely, oil filters, air filters for mechanical purposes, fuel filters, bushings and bearings, mechanical seals, transmission seals, engine seals, hoods, cam covers, engine covers, brake linings for machines, roller bearings, conveyor rollers, rollers for printing machines; Machine parts particularly for agriculture and forestry, mining and extraction of petroleum and natural gas, namely, oil filters, air filters for mechanical purposes, fuel filters, bushings and bearings, mechanical seals, transmission seals, engine seals, hoods, cam covers, engine covers, brake linings for machines, roller bearings, conveyor rollers, rollers for printing machines; Machine parts particularly for the industries whichproduce vehicles, apparatus and machines for transport on land, in the air, on rail and on water, namely, oil filters, air filters for mechanical purposes, fuel filters, bushings and bearings, mechanical seals, transmission seals, engine seals, hoods, cam covers, engine covers, brake linings for machines, roller bearings, conveyor rollers, rollers for printing machines; Machine parts particularlyfor the purification and keeping pure of liquids and gases, namely, oil filters, air filters for mechanical purposes, fuel filters, bushings and bearings, mechanical seals, transmission seals, engineseals, hoods, cam covers, engine covers, brake linings for machines, roller bearings, conveyor rollers, rollers for printing machines; Parts for machines for conveyance of bulk materials, for cranes,for lifting machines and hoists, for robots, for engines and clutches of machines except engines and clutches for land vehicles, namely, gears, step-up and step-down transmissions, mechanical controls, lubricating pumps; packaging machines, automatic industrial labeling machinesfor applying labels to packaging; electric, hydraulic and lubricating pumps; machine parts, namely, slides and valves being parts of machines; steam current generators; industrial machine presses; mechanical slide-ring seals; domestic appliances and kitchen machines, namely, electric pasta makers; parts for machines, namely, friction linings and linings forclutches and brakes, brake disks, bearings, cylinders, roller bearings, bursting discs, sealing rings, isolating slides, namely, for pumps and heat exchangers,all the above mentioned goods consisting of carbon or of plastic reinforced with carbon fibers or of a material from the above mentioned group, coated with a ceramic or metallic material, or of carbon bound with plastic, of sintered metal,of silicon carbide, of pyrocarbon, of pyroboronitride or of carbon impregnated with synthetic or natural resin or with metallic materials, including in each case graphitic forms of carbon; parts of machines, namely, fluid tanks lined with rubber or plastic; part of machines, namely, metal engine gaskets, electrical motor brushes and electrical contact pieces of motors including sliding contacts for the transmission of electrical currents, consisting of carbon, of carbon reinforced with carbon fibers, of plastic reinforced with carbon fibers, of carbon bound with plastic or of metal-containingcarbon, including in each case graphitic forms of carbon; parts for engines forland vehicles, namely, pistons, camshafts, bushings, bearings and seals