Granted in 1909 to Russell J. Fraser of Sydney, Nova Scotia. This presents the basic idea of a mouthpiece which slides along the front of the harmonica, with a hole in it to aid playing single notes and a pointer attached to the rear of it which indicates on a scale which hole of the harmonica is currently selected:
The back of the unit also had a music holder. Quoting from the patent text:
By using this attachment and employing music sheets which have indicated upon the numbers of the ducts which are to be played and their order, no knowledge of music or of the tune is necessary.
As an example, the inventor shows the tablature for a popular tune of the day:
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