Chord key calculator assembly

Details Chord key calculator assembly Chord key calculator assembly

1989-01-19

1990-10-09

Franklin, Lawrence R.

Music

Accessories

Teaching devices

G09B 1502

Patent

active

049613626

ABSTRACT:
A hand manipulable calculator assembly specifically designed to calculate chord/key construction in musical composition and incorporating a chord wheel, a note/key wheel, a major/minor wheel all being rotatably mounted relative to one another and to a fixed wheel of a support frame wherein conversion means in the form of color coded charts further are provided to determine intended chord/key calculations.

REFERENCES:
patent: 1431972 (1922-10-01), Mears
patent: 3481241 (1969-12-01), Gaillard
patent: 3728932 (1973-04-01), Leonard
patent: 3903782 (1975-09-01), Leonard
patent: 4074607 (1978-02-01), Bond
patent: 4503748 (1985-03-01), Barber

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