7436: Filtering & purifying machinery, for liquid or gas

74361: Machinery for filtering & purifying waters 74362: Machinery for filtering or purifying beverages 74363: Oil, petrol-filter for internal combustion engines 74364: Intake air filters for internal combustion engines 74367: Filters & purifying machinery for liquid, n.e.s. 74369: Filters & purifying machinery for gases, n.e.s. 7436: Filtering & purifying machinery, for liquid or gas