System and method for instruction in the operation of a keyboard musical instrument
Patent 4480521 Issued on November 6, 1984. Estimated Expiration Date: 
August 3, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 3, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3350973 Pocket-size musical chord study aid Electronic musical scale and chord display apparatus Teaching aid for keyed musical instruments Patent #: 4281579 AbstractA system and method for instruction in the operation of a keyboard musical instrument, namely, an organ or piano. The system and method teaches the proper fingering for chord triads in the root, first, and second positions so as to play chord triads in the space of a single octave. The system may be operated manually by the student or, in some embodiments thereof, the system may be operated automatically by means of an external storage media device such as a video disc player.Other References
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