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System and method for instruction in the operation of a keyboard musical instrument
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Pocket-size musical chord study aid
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Pocket-size musical chord study aid
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System and apparatus for keyboard instruction in playing chords in 3-4 or 4-4 time
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Programmed audio-visual presentation of information for instruction in the operating of keyboard controlled instruments
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Light bar indicator for keyboard teaching devices
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Audio-visual teaching device and method for instruction in the operation of keyboard controlled instruments
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Visual chord teaching device
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Apparatus for teaching the operation of a keyboard controlled machine or instrument
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Method of and apparatus for teaching the operation of a keyboard controlled machine or instrument
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