Vintage Brass Cornet Trumpet by Boosey London Heley C. 1950 Mid 20th Century

The cornet

Derived from the posthorn by applying rotary valves to it in the 1820s in France. By the 1830s, however, Parisian makers were using piston valves instead. Among the first manufacturers of modern cornets was Parisian Jean Asté in 1828. Cornets first appeared as separate instrumental parts in 19th century French compositions.
 
This instrument could not have been developed without the improvement of piston valves by Silesian oboe player Friedrich Blühmel and Heinrich Stölzel in the early 19th century. These two instrument makers almost simultaneously invented valves, though it is likely that Blühmel  was the inventor, and Stölzel who developed a practical instrument.They jointly applied for a patent and were granted this for a period of ten years. Later, and most importantly, François Périnet received a patent in 1838 for an improved valve which is the basis of all modern brass instrument piston valves.