Köchel catalogue Anh. A have been identified since 1965 as by Leopold Mozart. Many works in Anh. C have since been more reliably assigned to other composers, or to Mozart himself. To maintain as much of the original K-numbering of the list as possible, while re-ordering in the revised, chronological sequence, letters were added to the new numbers. The following list shows Köchel's original designation (K) and the sixth edition (K). Other addenda and supplements to the catalogue are marked "." (This has been abbreviated to 'Anh.' in the list below.) Works listed as composed for piano were most likely performed on
K. Rudzki i S-ka remainder in the hands of Alfred Czarnomski, Władysław Mazurowski and Józef Korycki. Since then the company started to expand rapidly. In 1879 there were 221 workers employed in Rudzki's Warsaw works, by the end of the 19th century the number rose to 890, while value of production rose from 180,000 roubles to 2,132,000 roubles. In 1892 the company was also formally transformed into a joint stock company. Initially the K. Rudzki i S-ka benefited from fast industrialisation of the Kingdom of Poland. In 1881 it obtained a patent for an innovative method of piping production, which allowed it to become