Rolmonica "pocket player piano" from 1930s Johnson Smith Catalog (Video)

Berjont says: "This 1928 Rolmonica is a Harmonica in a bakelite (plastic wasn't invented yet) case that works on the same principle as the old player pianos. It has a paper scroll inside the case that you manually crank as you blow (or suck air) through the mouthpiece."

Johnson Smith Catalog Item #27: Rolmonica (Thanks, Paul Di Filippo!)