Air filters for vehicle motors and engines; [ Door closers, hydraulic; Door openers, hydraulic; ] Filters for motors and engines; Fuel filters for vehicle engines; [ Knife grinding machines; ] Machine parts, namely, couplers and semi-couplers of synthetic material; Mechanical seals; [ Oil pumps for land vehicles; Pistons for engines; Pulleys being parts of machines;] Regulators being parts of machines; [ Spark plugs; Springs being parts of machines; Vacuum cleaner bags; ] ...