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US4404886A
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Note reading octave isolator
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US4295407A
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Keyboard simulation with vertical inversion indexes
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US4320690A
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Musical structural integrator
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US4254686A
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Octave subdivided diatonic scale organizer
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US4041828A
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Chord fingering coordinator
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US3977293A
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Left hand chord locator
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US4002097A
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Chord progression selector
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US3937118A
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Inversion sliderule
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US3919914A
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Keyboard instrument hand coordination trainer
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US3921493A
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Keyboard chord and rhythm coordinator
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US3884113A
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Slide rule chord indicator
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US3884111A
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Inversion maker and chord matcher
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US3903782A
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Primary chord organizer
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US3884110A
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Musical cycle differentiation aid
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US3884112A
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Key signature structure teaching aid
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US3888155A
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Finger pattern indicator
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US3884115A
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Interval teaching aid
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US3884114A
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Major and minor chord organizor
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US3903783A
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Inversion structure indicator
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US3890875A
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Octave locator for keyboard and note reading
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