صورة:DrehorgelLochkarte.jpg

• Description: Music roll of a barrel organ in place inside the organ. Each hole across the roll marks the position of a note. As the roll passes over the note valves, each hole allows air to pass through and sound one of the organ pipes.
• Source: photographed --Immanuel Giel 12:53, 6 Jun 2005 (UTC)

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