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Application filed by G Brennwald, Landolt J HrchfiledCriticalG Brennwald
Publication of CH16372ApublicationCriticalpatent/CH16372A/de
La fabricación de pianos que elevan adherido a su mecanismo ordinario un mecanismo neumático para poder ejecutar sin necesidad de saber de música y con su ayuda de rollos de papel perforado toda clase de piezas musicales.