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Ludwig Hupfeld
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5877. Hupfeld, L. March 10. Sliding valves.-A double slide valve for controlling the passage of air in a musical instrument is arranged to work' without friction. The primary valve is formed with an open-ended port g and a port n, and the secondary valve works over the port g only.
GB190605877D1906-03-101906-03-10Improvements in and connected with the Regulation of Tone in Mechanical Musical Instruments.
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