An abrasive jet-forming nozzle assembly is disclosed for use in a waterjet cutting system. The nozzle assembly includes a jet-forming orifice for producing a high velocity jet from a highly pressurized water upstream of the orifice, and a discharge tube downstream of the orifice for permitting abrasive...http://www.google.co.uk/patents/US4817874?utm_source=gb-gplus-sharePatent US4817874 - Nozzle attachment for abrasive fluid-jet cutting systems
