Köchel catalogue son's earlier works; Mozart's catalogue of his own compositions (begun in February 1784 with K. 449) allows relatively precise dating of many of his later works. The catalogue included the opening bars of each piece, known as an incipit. Köchel divided the corpus into a main chronology of 626 works, and five appendices ("" in German, abbreviated to "Anh.") The appendices (Anh. I-V) included: Since Köchel published his original catalogue in 1863 (now referred to as K), the dating of Mozart's compositions has been subject to constant revision. Many more pieces have since been found, re-dated, re-attributed and re-numbered, requiring
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