7
Filtering machines; Filters for machines; Drum filters; Cartridges for filtering machines; Filtering machines for chemical processing; Filtering machines, separators and centrifuges; Filters for gases (machines); Air filters for mechanical purposes; reversible flow filters [parts of machines]; Grease filters (parts of machines); Oil filters [machine parts]; Filters being parts of machines; Filters (parts of machines or engines); Membrane filters for use as parts of machines; Filter housings being parts of machines; filtration machines; portable filtration units [machines]; Filters insofar as not included in other classes; Filters that are not parts of machines or engines, for the separation of solid, liquid and gaseous substances
11
Water filtering apparatus for industrial use; Filters for water purifiers; Filters for water release devices; Pollen filtering apparatus; Filters for industrial use; Filters for industrial installations; Filters for gas extractors; filters for air purifiers; filters for waste gas purification; Filters for gases (industrial installations); Filters for exhaust extractor (parts of industrial installations); Filters for cleaning gases (parts of industrial installations); Filters for use with apparatus heating; filters for use with apparatus for steam generating; Filters insofar as not included in other classes; Filters that are not parts of machines or engines, for the separation of solid, liquid and gaseous substances; Air filters for use as dust extractors in industrial processes; Dust filters; Air filters; Filters for dust; Air Filter installations; Air Filtering installations; Filters for cleaning air; Filters for cleaning gases [parts of industrial installations]; Air cleaning filters (parts of air cleaning machines or installations); Air filters for industrial use; Air filters for industrial installations; Membrane apparatus in the nature of filters for purifying water; Industrial installations for filtering liquids