7 Pistons, piston pins, piston rings, piston ring segments comprised of piston rings, piston ring sets comprised of piston rings, and piston pin retainers, all for internal combustion engines; pistons for internal combustion engines; cylinders, cylinder heads, and liner sleeves for cylinders all being for internal combustion engines; slide bearings for combustion engines, slide bearings for gears, slide bearings being replacement parts, for machines or for machine elements with axial, radial and spherical slide faces, which are weighted and/or contacted by rotating, rolling, oscillating or stationary reverse rotation faces; internal combustion engine parts in the nature of crank, gear, coupling, fuel injection and steering gear housing; carburetors for internal combustion engines; engine valves, air switching valves, shutter valves, vacuum control valves, pressure retention valves, exhaust gas recirculation valves, control valves for exhaust gas purification, all being parts of machines or of internal combustion engines; injection devices, injectors for internal combustion engines; electric motors for machines, electric motors for powering of fuel pumps, air pumps, vacuum pumps, water circulating pumps and servo apparatus for motor vehicles; parts of machines, internal combustion engines and land vehicles, namely, valve seats, valve guides, and valve springs; non-electric motor-operated actuators for machines and internal combustion engines; gaskets and seals for internal combustion engines; filters for cooling agents, urea filters, air filters, fuel filters, and oil filters for motors and engines; fuel pumps, oil pumps, smog air pumps, water pumps, and vacuum pumps for internal combustion engines, machines and land vehicles; vacuum dashpots, vacuum actuators, suction pipes being air intake pipes for internal combustion engines, butterfly valves and throttle valve bodies being parts of machines and internal combustion engines; exhaust apparatus for combustion engines, exhaust pipes and silencers being parts of machines, internal combustion engines and land vehicles; fuel separators; exhaust gas valves; connecting rods for machines, motors and engines; crank shafts and cam shafts for internal combustion engines; rocker arms and pushrods for internal combustion engines; starters for motors and engines; igniting devices for internal combustion engines; compressors for use in internal combustion engines; exhaust gas purifying devices, namely, catalytic converters; cooling radiators for motors and engines, including exhaust coolers, charge coolers and oil coolers; turbo compressors as parts of machines, motors and engines; electric motors for operating window winders and seat adjusting devices