 These machines are most widely developed and used throughout Asia where the most popular type is the Engelberg huller designed by German Brazilian engineer Evaristo Conrado Engelberg in Brazil and first patented in 1885.The Engelberg huller uses steel rollers to remove the husk.Other types of huller include the disk or "cono" huller which uses an abrasive rotating disk to first remove the husk before passing the grain to conical rollers which polish it to make white rice, this is done repeatedly since other sides of circular side of rice are not husked.