 In the film Dick Goodwin mentions that the Reuben Sandwich as being  the only "truly invented" sandwich in the world and he credits a  Reuben K (actual name Reuben Kulakofsky) as having invented it. It  was entered into a national sandwich competition in 1956 by a Fern  Snider. Truth is that the inventor of the sandwich is unknown and  the recipe goes back to about 1908 which is about 20 years before Mr  Kulakosky first invented it.