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
Reșița works the last quarter of the 19th century. For decades, the two complemented each other within the same integrated factory. Until 1855, the works belonged to the Treasury of what had become the Austrian Empire, which exercised control through the Banat Mining Directorate in Oraviţa. By 1815, they were producing cast iron pieces coming directly from the furnaces, rods forged from iron, hoops for cart wheels, tools, nails and utensils for agricultural and home use. In 1855, with the empire facing financial crisis and looking to sell, the works were bought by an international consortium, the Imperial Royal Privileged Austrian State