Alto Trombone History Update

Added entries related to alto trombone in the Trombone History Timeline and Alto Trombone Timeline. Both have to do with late 19th-century instrument manufacturers (Boosey in London and Zimmermann in Leipzig) and their alto trombone production/offerings. This information may be of interest to some because it is from a period of time when alto trombone is thought to be nearly obsolete.

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