Wherein the walls of the booth is perforated or porous walls and

Official title: {wherein the walls of the booth is perforated or porous walls and the walls are cleaned of or prevented from being contacted with excess material by a flow of fluid, e.g. air or water, directed into the booth}

B05B14/412 (Wherein the walls of the booth is perforated or porous walls and) appears on 8 US grants and 6 published applications in this corpus.