Musical instruments – Keyboard type – Element or attachment
Patent
1978-10-02
1985-05-28
Stearman, Joel
Musical instruments
Keyboard type
Element or attachment
D17 5, D17 7
Patent
active
D02790122
REFERENCES:
patent: 2488170 (1949-11-01), Calamari et al.
Corrigan Jane E.
Stearman Joel
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