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To produce a sound, rollers have to moved by hand. In the rollers are small iron pegs, which come out of the openings in the middle of the roll if turned around and hits an iron kind of bar behind the rollers (bar divided in sections each apparently with its own notes), which produces the individual sounds.
Both items are the same, bar for the small fact that the colors of the rollers are red/yellow/blue on one and inversed blue/yellow/red on the other; the last one mentioned has no top label, but same information in back.
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