Trumpet in F by A. G. Guichard, Paris, ca.
1840 featuring Stölzel piston valves. From the National
Music Museum.
A Very Brief History of the Trumpet and Bugle Through the Eighteenth Century:
Evolution of the Military Bugle in the Nineteenth Century:
Evolution of the North American Competition Bugle 1900 through 1967: http://www.middlehornleader.com/Evolution%20of%20the%20Bugle%20--%20Section%203.htm
Evolution of the North American Competition Bugle 1968 through 2006: http://www.middlehornleader.com/Evolution%20of%20the%20Bugle%20--%20Section%204.htm