This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Polsterpfeife. de Prinzipskizze fr die Funktion einer Polsterpfeife en Schematic diagram for the function of cushion whistle eigene Herstellung Reinhard Whistles Music diagrams
Page 2023 Free-images.com. All images are Public Domain