The Bruno Sommerfeld Piano Factory (Polish: Fabryka Pianin i Fortepianów Brunona Sommerfelda) operated in Bydgoszcz from 1905 to 1945.

[2] In 1905, Sommerfeld established a small locksmith's shop which soon started repairing keyboards (German: Reparaturwerkstatt), under the name Pianoforte-Magazin at then 47a Elisabeth straße,[3] today's 30 Śniadeckich street.

In the showroom, around 100 instruments were displayed; in addition to the above German brands, one could find pianos from Steinway & Sons based in New-York or Carl Bechstein in Berlin.

From 1937, Grzegorz Kardaś, a famous Polish pianist and director of the Kuyavian-Pomeranian Radio Broadcasting Station, was the manager of the Warsaw office located at 83 Marszałkowska street.

The instruments were appreciated by famous musical figures, like Arthur Rubinstein, or Polish composer Feliks Nowowiejski, who visited the manufacture premises on March 18, 1930.

During the entire interwar period, including the Great Depression, the factory produced a yearly average of 1,500 instruments[8] till September 1939.

(as Sommerfeld was the sole owner of the firm from December 30, 1940) and under this name, it had branches in Bydgoszcz, Katowice, Łódź, Poznań and opened representative offices in Gdańsk, Kraków and Warsaw.

In late January 1945, during the fights for the liberation of the city, the factory equipment was completely burned down after artillery shells hit warehouses, causing a fire.

[2] In July 1945, the company was nationalized and its management moved to the hands of the Union of the Local Wood Industries (Polish: Zjednoczenie miejscowego przemysłu drzewnego).

[5] Several pianos from Sommerfeld's factory are preserved in the Pomeranian Philharmonic collection exhibited in the Old Palace in Ostromecko, 15 km east of Bydgoszcz.