Violin Concerto No. 7 (Mozart) to the insertion of new works bearing the numbers K. 271b to K. 271H in the catalogue. He believed that the work was based on a rough sketch of a violin concerto by Mozart from 1777, but states that the original form of the work cannot easily be reconstructed. The uncharacteristic number of passages for the solo violin in the high register, in "pizzicato" (in the second movement), and in double stops in tenths were considered by Einstein to be 19th-century additions. Friedrich Blume, on the other hand, was firmly in favour of the work's authenticity, stating that "not one
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