Title:
Piano keyboard
United States Patent 2557690
US Patent References:
/0449756.html
- - 0449756

/0888100.html
- - 0888100

Indicator for piano or organ keyboards
- - 1576004

Pianoforte keyboard
- - 1958227


Inventors:
Reuther, John H.
Publication Date:
06/19/1951
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Assignee:
Reuther, John H.
Primary Class:
84/423R
Other Classes:
84/427
International Classes:
G10C3/12