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Wikipedia definition
1. Slide whistleA slide whistle (variously known as a swanee or swannee whistle, piston flute or jazz flute) is a wind instrument consisting of a fipple like a recorder's and a tube with a piston in it. Thus it has an air reed like some woodwinds, but varies the pitch with a slide. The construction is rather like a bicycle pump. Because the air column is cylindrical and open at one end and closed at the other, it overblows the third harmonic.
Read “Slide whistle” on English Wikipedia
Read “スライドホイッスル” on Japanese Wikipedia
Read “Slide whistle” on DBpedia

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