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The Wagner tuba is a narrow-bore tuba with a French-horn mouthpiece. Tubas appeared first in Berlin in the 1820s, soon after the invention of the valve. They were soon accepted into the band and orchestra, displacing the serpent, ophicleide, and other such instruments of poorer tone quality and intonation.
Lionel C. Sternberger is believed to have invented the cheese hamburger in the 1920s in the Northeast portion of Los Angeles County. Tales differ, however, as to precisely when this occurred, and where. Some peg the date as 1924, others as 1926.