| http://www.w3.org/ns/prov#value | - tor systemUS467614717 Jul 198530 Jun 1987Mankowski John PRoof ridge ventilatorUS47620532 Jun 19879 Aug 1988Air Vent Inc.Replacement filtered soffit ventilatorUS477626222 Jun 198711 Oct 1988Air Vent, Inc.Preventing insects and other pests from entering an attic spaceUS48038131 Aug 198814 Feb 1989Liberty Diversified IndustriesFoldable corrugated plastic roof ventilatorUS480740917 Jun 198728 Feb 1989
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