Rieger-Kloss was an organ-building company based in Krnov, Czech Republic, that operated from 1947 until 2015. The company emerged from the remnants of the Rieger Orgelbau firm after its original owners were expelled from Czechoslovakia in 1945. Throughout its operation, Rieger-Kloss produced more than 600 organs that were distributed across various countries including Czechoslovakia, the Soviet Union, China, Japan, and the United States.

The company's origins trace back to the Gebrüder Rieger organ-building firm founded in 1845 by Franz Rieger in Jägerndorf, then part of Austrian Silesia. After the original Rieger family was forced to relocate to Austria post-World War II, the Czech government established a state-run organ-building firm at the original Krnov site. This new firm, initially staffed by few qualified workers, primarily produced instruments for the domestic market with basic technical features like cone chests and pneumatic actions. However, the firm eventually developed more advanced organs with slider chests and mechanical actions. After the Velvet Revolution, Rieger-Kloss expanded its market internationally and continued its operations until it declared bankruptcy in 2018.

https://de.wikipedia.org/wiki/Rieger-Kloss