7 filters for the purification of air, gases or fluids as parts of motors, engines, and machines; filter systems comprising filter housing and replaceable filter elements as parts of machines, motors, and engines; filter elements for filters and filter systems as parts of motors, engines and machines all used for mechanical purposes, namely, filter elements for fuel filters, in-line fuel filters, in-tank fuel filters, oil filters, gear oil filters, urea filters, filters for hydraulic fluids, filters for coolants, cooling water filters, washer system filters, spin-on filters, air filters, intake-air filters, aeration filters, ventilation filters, filters for electric discharge machines, liquid filters for machine tools, backflushing filters for liquids, disc filters, filters for compressors, filters for vacuum pumps, vacuum filters, and filters for compressed air systems; air filters as parts of machines, motors, and engines; air filter systems comprising air filter housing and replaceable air filter elements as parts of machines, motors, and engines; cyclones being centrifugal separators for air filters and air filter systems for machines, motors and engines; centrifuges; resonators as parts of motor or engine air intake systems being manifolds for the attenuation of sound and absorption of vibration; sound absorbers as parts of machines, motors, and engines; ducts as fitted parts of motors or engines for supply and discharge of air; flaps as parts of motors, engines or machines; valves as parts of motors, engines or machines