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US Patent 1573242

Awarded to Walter A. Hand of Brooklyn, New York, in 1926 and titled simply "Attachment for Harmonicas", this version of the harmonica/pointer/chart idea has a chart which can be moved line by line to indicate how the tune should be played. The player starts with the pointer indicating the required note on the uppermost line of the chart and the chart is moved one line at a time to indicate where the player has to move the mouthpiece to get the next note.

The mouthpiece was designed to clip on to a standard diatonic harmonica and exposed four holes at a time, to enable the player to play chordal accompaniment as well as single notes.

This invention was also covered by Canadian Patent 258696, issued the same year. They were offered for sale at the princely sum of one dollar each, according to this 1925 ad from the scouting magazine Boys' Life:

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