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Marquis Hoài Văn, better known as Trần Quốc Toản (chữ Hán: 陳 國 瓚), born 1267 (fl. 1267–1285), was a marquis of the Trần dynasty who was well known for his active role in the second war of resistance of Đại Việt against the Mongol invasion.
In instruments such as the trombone and slide whistle, moving the slide is the way to select the note while playing. Attempts to adapt other wind instruments to use slides instead of tone holes, keys or valves have been tried; for example a slide saxophone was invented in the 1920s by Chicago instrument maker Reiffel & Husted. [1]