Beregszászy, Lajos (Louis) (Békés, 5 January, 1817 - Budapest, 4 April 1891) – Piano builder, inventor. He learned his trade at Temesvár (now Timişoara, Romania), Pest, Hamburg, London and Vienna. Between 1846 and 1879 he worked in Pest and owned a piano-manufacturing firm. Franz Liszt mentioned his work with appreciation. Among his famous inventions were a new piano key system and the so-called “cello, lowest register”. The German piano builder Bösendorfer bought both his inventions and used them after 1878 in his world famous pianos. Bösendorfer used the Resonanzboden (Sounding board) as “System Beregszászy” in his instruments. – B: 1160, T: 7684.→Liszt, Ferenc.