Uniform piano keyboard
United States Patent 3022698
US Patent References:
/0152726.html
- - 0152726

/0334484.html
- - 0334484

Sheet of music
- - 1473495

Music teaching device
- - 2406946


Inventors:
Lucas, James W.
Publication Date:
02/27/1962
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Assignee:
Lucas, James W.
Primary Class:
84/423R
Other Classes:
84/483.200, 84/423A, 84/425, D17/9
International Classes:
G10C3/12