Arrangements or fixed installations methods or devices for cleaning or clearing sewer

Official title: Arrangements or fixed installations {methods or devices} for cleaning {or clearing} sewer pipes, e.g. by flushing (sediment traps, rakes, screens, or the like, arranged in sewer lines E03F5/14; cleaning pipes in general, devices for cleaning pipes B08B9/02 {; gullies provided with flushing means for cleaning or emptying E03F5/0402; devices to remove obstructions in waste-pipes or sinks E03C1/30})

E03F9/00 (Arrangements or fixed installations methods or devices for cleaning or clearing sewer) appears on 516 US grants and 349 published applications in this corpus.