Last modified on 7 October 2014, at 02:41

Category:Piano accordion

NOTE: "Acordeón Reuther" was merely one of the accordion brands, and John H. Reuther's inventions used on it were not about the normal piano accordion, but about the Reuther uniform keyboard system (U.S. Patent 2,203,393) and the dual-row piano keyboard (U.S. Patent 2,557,690) for accordions.